Dear aspirant , 

If you  have done your post graduation then why you want to apply for post graduation degree again ? 

You may know that MBA itself is a post graduation degree . You can apply for MBA but you will get admission  not on the basis of your other post graduation degree , it will be on ultimately on the basis of your graduation degree . There is no criteria for applying for MBA on the basis of other PG degree. You have to give entrance exams like CAT , SNAP , MHT-CET , XAT , NMAT etc : 

I would advise you to do some research and ask college representatives about it , also you can join MBA for 1 year other than 2 year full time or a part time. 

Hope it will help you.