The record-breaking swimmer revealed that he will be starring on the fifth season of Golf Channel's The Haney Project.
"I have travelled the world through swimming, but really haven't had an opportunity to experience the world through my travels," Phelps said.
"As I enter this next chapter of my life, I think I will be able to shift my competitiveness to anything I put my mind to and golf is one of the things I want to focus on," he continued.
"If I have a goal of dropping a certain amount of shots, or working on my short game or putting, those things are going to keep me motivated and fire me up and keep me excited."
The Haney Project follows Tiger Woods's former coach Hank Haney as he tries to teach celebrities how to master the game of golf.
"I want to play all the world's great golf courses, but I'd like to play them well," Phelps explained of his decision to join the show. "I'm excited about this project with Golf Channel and I'm looking forward to working with Hank and see what we can do together on the golf course."