You may have discovered this already, but our affiliate website, The Museum of Gaming History (MOGH) has listings for India casinos. See this link:
http://www.themogh.org/cg_home2.php

Underneath the map, see the line that says "Quick Select" -- enter "Asia" for region, and "India" for state.
You'll see a list of a number of open casinos, complete with website links to verify if open.