BENGALURU, Feb 26 (Reuters) - India's Paytm said on Monday Vijay Shekhar Sharma would step down as non-executive chairman and board member of its payments bank's unit, as the embattled digital payments company overhauls its board after a central bank clampdown.

The action against Paytm Payments Bank followed "serious supervisory concerns", including inadequate customer identify and a lack of arms length distance with Paytm, sources had told Reuters.

The Reserve Bank of India has asked the banking unit to wind down its operations by March 15 due to persistent non-compliances and continued material supervisory concerns, triggering a meltdown in Paytm's stock.

Srinivasan Sridhar, former chairman of state-owned Central Bank of India, former Bank of Baroda Executive Director Ashok Kumar Garg and two retired Indian Administrative Service officers will join the board, Paytm said in an exchange filing.

The new board members' expertise will be "pivotal in guiding us toward enhancing our governance structures and operational standards, further solidifying our dedication to compliance and best practices", Paytm Payments Bank CEO Surinder Chawla said.

Paytm supports its banking unit's move of opting for a board with only independent and executive directors by removing its nominee, it said, adding Sharma was also stepping down from the board to "enable the transition".

Sharma owns a 51% stake in Paytm Payments Bank, while One 97 Communications, as Paytm is formally known, owns the rest. (Reporting by Chris Thomas in Bengaluru; Editing by Shounak Dasgupta and Arun Koyyur)