Hi Sankar,
If you want to get a list of SAP institutes, it is very simple to find it online. However, if you are looking for a legitimate one, it can be a bit challenging. I would not recommend doing the SAP course at authorized centers due to the high costs involved, and these institutes often complete the course in just 20 days. No institute can guarantee placement, as it ultimately depends on one's ability to market themselves to potential employers.
Regards,
Shereef