Return to u.s after coming back to india

I came back to India as soon as I finished my MS, since I had some personal issues. It has been more than a year since I came back. I hope to return to u.s someday.
I had done a 6 months internship while I was studying. Is it a good idea to email my supervisor about potential job opportunities? How can I ask about work visa sponsorship? Please advice.

Your query for potential job opportunities where you previously interned must be separated from query regarding visa sponsorship. US employers get confused with visa questions. You have to do your own research and help employer most of the time on options under which you can be permitted to work. Hope this helps