Add link to button in infopath

There is no way to Redirect a "Submit button" but to add script on the page. You can do this using Designer.

Find the ID of your button and add the following code:

<script>     
function setEventHandler()
{
 var btnSubmit = document.getElementById("ctl00_Something");

 btnSubmit.onmouseup = function(){Button.OnClick(this, event); window.location='http://www.google.com';};
}
</script>

Call this function in your pageLoad or you can write the code inside your pageLoad function.

Here, onmouseup will call default method of Info Path for closing the form and then the even will be binded.

Try it and let me know if it works. I haven't tried it.