The 33-year-old former world No.38 from Mumbai will take on a wide role, including liaising with existing PSA World Tour events in the region, attracting new events to India and the region and ensuring that PSA requirements are delivered across events, press, media, player welfare.
A PSA member from 1999 to 2011, Bhattacharya won eight Tour titles from 12 final appearances and celebrated a career-high world No.38 ranking in November 2006.
Originally from Delhi, he claimed the national title five times in his career between 1998 and 2005.
"We are delighted to announce Ritwik in this new position within PSA," said PSA CEO Alex Gough.
"South East Asia is a very important one to the sport and we are delighted to have someone with such a wealth of experience in the squash world representing us here.
"Ritwik's initial focus will be in India where we hope to see great strides in a market where there is such great potential in squash," Gough added.