You should be able to make a snippet then call the snippet from your action sequence instead of the go to url. See this post: https://community.skuid.com/t/javascript-snippet-to-open-popup-window

You can call the action framework declaratively with the button component to generate the popup. Then in the popup, add a template component and pull the page in with an iFrame. iFrames do need a little tinkering to look right on the popup and here’s some css to get you started. Also, here’s an example of the html that would go in the template

.iFrame-responsive {
width:100%;
height: 70vh;
margin: 10px 0;
overflow: auto;
position:relative;
border:none;
}

John is correct if the site you are framing is iframe compatible which I find many are not. This also confines the pop up to be an overlay on top of your main page and can’t function as a separate window. Provided these things are good for your use case, John’s option is probably best. Otherwise I have found opening the site in a new tab or using the JavaScript pop up to be more effective.

This is a good callout.  I prefer to only use iFrames when there’s a discreet function that I want to integrate into the skuid experience.  If it’s a full blown site, it’s much cleaner to open a new page.