Hi Seema,
As I have already told Siemens are the only authorised trainers across the globe as SAP has been developed by them. I don't know abt Mumbai but here in Delhi they have training centre in Gurgaon(NCR Area). You can check with Siemens people in Mumbai regarding this. It costs approx. Rs 3 L . Also C-DAC, a govt. institute for advanced computing studies offers course in SAP. It is having centre in Noida (Delhi NCR). It must be having centre in Mumbai. You can check on net. It costs abt Rs 60,000/-
Its a good deal. Both Siemens & C-DAC are full time course. Also there are some pvt institutes offering SAP training in Delhi/NCR. They give u theoratical exposure (along with working on the ERP package) which combined with ur domain experience, make it useful for fetching good jobs. They charge approx. Rs 30000/- There may be some such institutes in Mumbai also. These institutes are good for working professionals like me as they are having flexi-timings according to ur convenience and also work on sundays.
Hope this information will help u in a small way.
Regards
Amit Singh