Hi Payal,
I think you may need to alter/refresh your perception on HR and SAP. HR is a profession whereas SAP HR is a product. When considering the HR profession, you have a whole lot of options. You can start working in HR Admin, Recruitment, Employee Relations, Performance Management, etc.
If you have a professional degree in HR with 2-3 years of experience in HR, by learning SAP (which is one among many such ERP packages), you can try for SAP functional consultant or support jobs. Usually, System Integrators or companies planning to implement SAP would be hiring such professionals.
The recession made SAP India freeze all its hiring plans in the Bangalore facility, so I'm not sure about prospects in SAP (you may check with SAP India or the Alumni network or Authorized Training Centers or Career Sites to find authentic information).