i have completed diploma in mechanical engg and post diploma in tool design and CNC from govt tool room , can i do SAP and if yes how do i choose a module .

No, if you want to do SAP from authorised institute, graduation is compulsory. you can do it from unauthorised institute but unauthorised institute may not be able to place you in good career Also bigger companies hire graduate specifically so it is better of you continue your job and focus on compl