dwt to kml conversion actually does not make much sense, considering .dwt is template for AutoCAD. What you can do however is to prepare new CAD file based on the template and eventually export it as KML file, but that is not file conversion, just how you work with AutoCAD.
You can certainly find interesting guides and tutorials about working with Google Earths format in AutoCAD on the Internet or YouTube.
Updated: September 26, 2023