Cape Town - South African golf trio JC Ritchie, Daniel van Tonder and Neil Schietekat will tee it up at next week's Indonesia Open.
Fellow countryman Justin Harding won the Asian Tour tournament last year, in what was only his first start on the Tour.
Harding will not be competing in the event this year, as he is attempting to earn his PGA Tour card at the Korn Ferry Tour Finals.
"It's with sad regret that I'll not be able to come back to defend my title but it's awesome that there are four more players from the Sunshine Tour that have been invited to play at the Indonesia Open," said Harding via a press release.
"I'm happy they will have the same opportunities that I had to showcase their skills and potentially lift the trophy so that they can compete on the Asian Tour and take the same route that I took."
Ritchie and Van Tonder are placed first and second respectively on the Sunshine Tour's Order of Merit.
Grant Wilson, Chief Operating Officer of the Sunshine Tour said: "We are delighted that the success of Justin Harding in Asia last year has inspired our members to think wider than South Africa as a competitive playground and the Asian Tour presents a number of great opportunities to play against the best players from Asia.
"The Sunshine Tour and Asian Tour have built a firm relationship based upon our desire to cooperate and provide reciprocal opportunities for our members. To become an international star you need to learn how to win on various Tours and compete with the best anywhere and this is the opportunity that Asia now presents for our young South African players."
The Indonesia Open will be take place from August 29-September 1.