Hi Sagar,
SAM's 3D shade calculator does not have an import function to import files from SketchUp or or CAD software.
If you are familiar with computer programming or scripting and with the SketchUp file format, you could use the shade calculator's scripting capability to write your own script to import the files.
Please see this Issue on the SAM GitHub repository for additional discussion:
github.com/NREL/SAM/issues/208
Best regards,
Paul.