Squash players around the world will band together this Sunday to support the sport's bid to be included in the 2020 Olympic Games.

The World's Biggest Squash Game will feature 30,000 players taking to the courts in traditional powerhouse nations such as England, Germany, Egypt and the United States, as well as smaller countries including Malta, Uganda and the Cook Islands.

More than 50 Australian clubs and centres will be participating and Squash Australia chief executive Gary O'Donnell said the event is a big part of the push for Olympic inclusion.

"I am thrilled so many have decided to get behind the sport's Olympic bid in this very visible way," said O'Donnell.

In September next year, the International Olympic Committee will vote on whether to include squash in the 2020 program, with baseball, karate and wakeboarding also in contention.