Entering biology will be a bit difficult after B.tech, surely you can consider taking up a specialization in bioinformatics at masters level.
There are options like M.Tech., M.E, MBA, MS that you can consider.
For Indian colleges offering these courses you can log on to http://www.youngbuzz.com/colleges-guide
FOr study abroad options you can log on to http://www.youngbuzz.com/studyabroad
This will surely help.