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Follow below documentation:

Feature:
Show popup on sold out buttons click.
___________________________________________________________
Solution:
Create a new snippet and name it 'popup-outofstock.liquid'
Paste attached code.
======
Go to theme -> Edit code -> Assets -> theme.js
Find .filter("[data-add-to-cart-text]");
Paste below code just under this .filter("[data-add-to-cart-text]");
if (a.available) {
    if (document.getElementById("main-atc-btn")) document.getElementById("main-atc-btn").style.display = "block"
    if (document.getElementById("myBtn-outofstock")) document.getElementById("myBtn-outofstock").style.display = "none"
} else {
    if (document.getElementById("product_name_with_variant")) document.getElementById("product_name_with_variant").value = a.name
    if (document.getElementById("main-atc-btn")) document.getElementById("main-atc-btn").style.display = "none"
    if (document.getElementById("myBtn-outofstock")) document.getElementById("myBtn-outofstock").style.display = "block"
}
======
Go to Sections -> main-product.liquid and find data-add-to-cart
Add an ID to this button id="main-atc-btn"
Render the out of stock snippet after the endform which has this submit button.
{% render 'popup-outofstock' %} 

Popup Code:

<style>
.modal.outofstock {
  display: none;
  position: fixed;
  z-index: 999;
  padding-top: 100px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgb(0,0,0);
  background-color: rgba(0,0,0,0.4);
}
#myBtn-outofstock {
  display: block;
  border: 1.5px solid #4f4f4f;
  border-radius: 25px;
  background-color: #fff;
  color: #4d4a42;
  text-transform: uppercase;
  padding: 5px 10px;
  font-size: 12px;
}
.outofstock .modal-content {
  background-color: #fefefe;
  margin: auto;
  padding: 20px;
  border: 1px solid #888;
  width: 80%;
}
#popup-submit-btn {
  width: fit-content !important;
  margin-top: 20px;
}
.outofstock .close {
  color: #aaaaaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
}
.outofstock .close:hover,
.outofstock .close:focus {
  color: #000;
  text-decoration: none;
  cursor: pointer;
}
.modal-header {
  text-align: center;
}
#product_name_with_variant {
  text-align: center;
}
.success-message {
  text-align: center;
}
@media only screen and (min-width: 800px) {
  .outofstock {
    top: 10% !important;
  }
  .outofstock .modal-content {
    width: 35%;
  }
}
</style>
<!-- Trigger/Open The Modal -->
<button class="button button--large" id="myBtn-outofstock">Out of stock</button>
<!-- The Modal -->
<div id="myModal" class="modal outofstock">
  <div class="modal-content">
    <span class="close">&times;</span>
    <h3 class="h3 modal-header">OUT OF STOCK!</h3>
      <div id="template" class="column righty-form">
      {% form 'contact' %}
        {% if form.posted_successfully? %}
          <p class="success-message"><strong>{{ 'contact.form.post_success' | t }}</strong></p>
        {% else %}
          {% if form.errors %}
            <ul class="errors">
              {% for field in form.errors %}
                <li>{{ field | replace: 'body','Message' | capitalize }} - {{ form.errors.messages[field] }}</li>
              {% endfor %}
            </ul>
          {% endif %}
          <div class="flexible-layout flexible-layout--form">
            <div class="column column--full">
              <input
                type="text"
                id="product_name_with_variant"
                name="contact[name]"
                value="" />
              <label for="contact_email">{{ 'contact.form.email' | t }}</label>
              <input
                type="email"
                required
                id="contact_email"
                class="email"
                name="contact[email]"
                autocomplete="email"
                spellcheck="false"
                autocapitalize="off"
                value="{% if form.email %}{{ form.email }}{% elsif customer %}{{ customer.email }}{% endif %}" />
              <div class="">
                <button type="submit" id="popup-submit-btn">{{ 'contact.form.send' | t }}</button>
              </div>
            </div>
          </div>
        {% endif %}
      {% endform %}
    </div>
  </div>
</div>
<script>
  // Get the modal
  var modal = document.getElementById("myModal");
  // Get the button that opens the modal
  var btn = document.getElementById("myBtn-outofstock");
  // Get the <span> element that closes the modal
  var span = document.getElementsByClassName("close")[0];
  // When the user clicks the button, open the modal
  btn.onclick = function() {
    modal.style.display = "block";
    if (document.getElementById("popup-submit-btn")) document.getElementById("popup-submit-btn").innerText  = "Enviar"
  }
  // When the user clicks on <span> (x), close the modal
  span.onclick = function() {
    modal.style.display = "none";
  }
  // When the user clicks anywhere outside of the modal, close it
  window.onclick = function(event) {
    if (event.target == modal) {
      modal.style.display = "none";
    }
  }
</script>  

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