Some of the colleges which provide executive MBA courses in Mumbai are:

• Prin. L. N. Welingkar Institute of Management Development and Research
• Indian Institute of Technology, Bombay
• School of Business Management - NMIMS University, Mumbai
• K. J. Somaiya Institute of Management Studies and Research
• Global Business school
• SP Jain.

It is generally a one year course for working professionals. The admission, selection process may vary. You can check their official site for more information or even ask here.

All are based in Mumbai.

Good Luck.