Return HTML Template Page with PHP Function

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I want to create a form that I can use a shortcode to insert into my site.

It would be really nice if I could create the HTML part in a seperate file and then insert it with a PHP shortcode (to seperate the logic of the page from the mechanics of making it into a shortcode).

How could I do this?

— Update —

This is what I’ve done:
I have two files. One called ‘profiletemplate.php’ and one called ‘scodes’. They are both part of a plugin that I am making for my site with an init.php that initializes them. Here is their content:

init.php

<?php
require_once(dirname(__FILE__).'/pages/scodes.php');
?>

scodes.php

function jf_testcode() {
    include dirname(__FILE__) . 'profiletemplate.php';
}

add_shortcode('testfield', 'jf_testcode');

profiletemplate.php

<?php // Template for my form shortcode ?>
<form>
Testing
</form>

I then use the [testfield] shortcode on a page in my site.

Update 2

So this method is working, but it isn’t inserting the HTML where the shortcode is called. Instead it is just inserting the content at the top of the page (like if I said ‘echo ‘Testing” instead of ‘return ‘Testing” in a function.

2

Something I forgot in my previous comment was that shortcodes return content, both the suggested include and my alternative get_template_part will directly output the content (which is what you are seeing with the content appearing at the top of your page instead of where the shortcode is called). To counteract this we must use output buffering.

Define the shortcode in your functions.php (or your site’s site-specific functions file). 

function my_form_shortcode() {
    ob_start();
    get_template_part('my_form_template');
    return ob_get_clean();   
} 
add_shortcode( 'my_form_shortcode', 'my_form_shortcode' );

Then in your theme folder you need a file called my_form_template.php which will be loaded anywhere you place the shortcode.

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