The Australian confirmed at a press conference hosted by the tournament organisers that he would be playing in the inaugural event which is slated to run between November 28 and December 20.
The format is loosely based around that of cricket's Indian Premier League, with franchises bidding for players who will then represent their team in home and away fixtures.
Five teams were also announced on Tuesday, with a release confirming that Bangkok, Kuala Lumpur, Mumbai and Singapore would be joined by "one more city in the Middle East".
"I have heard of the many ideas being added to the league and I am excited to have confirmed my participation," said Hewitt.
"I wait to see whose team I am on, I do not have any preferences as I know there are a lot of fans waiting to see world class tennis in all cities."
The player draft is due to take place in the United Arab Emirates on March 2, but it remains to be seen who will enter.
Rafael Nadal's long-time media manager is looking after the tournament's press coverage, while Novak Djokovic's coach, Boris Becker, is one of the event's founders.