Hi Nainesh,
You can use search help exit to restrict selection. The search help user exit has to be function module with same interface as FM F4IF_SHLP_EXIT_EXAMPLE has. IF you have a look at this FM then you can see where you should put your authorization check.
Your development team will know how to do this. If you do a search on "search help exit" you will get a few hits on SDN
There is another abap development which can be used ( but I shall not recommend any modification to standard programs).
Refer thread : https://scn.sap.com/thread/1866008
Hope this helps.
Regards,
Deepak Kori