There are various Technical and Functional SAP R/3 Module. Ex. ABAP, BASIS, FI/CO, HR, MM, PP, QM, PM, SD, BW/BI, Xi, CRM, SCM, SRM, APO, PLM, PS.. Basically you need to choose as per ur educational background and work experience .
if you have an MBA degree related to marketing go for SAP SD or CRM .
if you have an MBA degree related to finance go for FICO
If you dont have MBA den go for Technical stuff like Basis or ABAP.