SPRO Restriction based on userid

Hi Experts,

i am new to the security, kindly help me  in below issue.

i need to restrict the SPRO based on the module wise. i have create the new project under SPRO_ADMIN and assign user and user can able to view the project in there SPRO transaction code. In SPRO in need to restrict the user to access only the custom project. If the user is trying to access the SAP Standard IMG i need to restrict.

Kindly suggest.

Regards,

Mohan