SolidWorks CAD drawings (.slddrw) can be exported and saved to many other CAD formats, including IGES 3D exchange format (.iges, .igs), so slddrw to iges conversion is certainly doable. Except for the obvious choice here, SolidWorks itself, you can use any of the other solid choices for this conversion, including some dedicated 3D model conversion tools.
Open SLDDRW file Open IGES fileA CAD converter with huge format support