I assume you want this to be output inside of the_content()?
You would probably have to define a shortcode that will output the_post_thumbnail(). You could either define the shortcode to accept a URL as an argument, or else wrap the shortcode with HTML anchor tags.
EDIT:
Assuming you’re already outputting the_post_thumbnail() inside of the_content(), you could add a custom field into which the user enters a URL, and then, if the URL is present, output anchor tags around the call to the_post_thumbnail().
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