Sky Island is a golf course in Mario Golf: World Tour that takes place high in the air. As such, Para-Beetles and Jumbo Rays can be seen flying around the area, however, they do not serve as obstacles. This course is unlocked by completing the nine-hole One-On, One-Putt Challenge in the Castle Club. All holes are par 3 and have one tee box each, unlike every other course in the game, which has three tee boxes per hole. This course is par 54, like Congo Canopy, Golf Guru's Pitch and Putt and Elf's Short Course. Its music is a cover of the athletic theme from Super Mario Bros. 3.
Doing the One-On, One-Putt Challenge again and clearing all 18 holes will grant the player a Propeller Mario costume. The reward for succeeding in all Star Coin challenges for this course is a Diddy Kong costume.