Hi Indu
Look you already have done double post graduation what will be the fun to go for another post grad degree. I have a better option for you. If you want to go for further education, go for Ph D in your chosen subject. It will solve your three purposes. One, it will quench your thrist to study. secondly it will help you to acquire a good teaching position in good college. Thirdly, Phd is not a regular programme, there is just a certain hours of supervision you need to take from your guide and prepare a thesis. ( but mind you! this does not mean that phd is an easy cake walk, you have to put in a lot of efforts to qualify) i think this will solve your problem. and if you are really keen to go for business management. go for a diploma for one year and after that go for Phd in your interest area.
Regarding IIIT, pune go to their website you will get the information.
Hop it gives you some direction to think.
Regards
Hitesh