Jarmo Sakari Sandelin (born 10 May 1967) is a Swedish professional golfer.
Sandelin was born in Imatra, Finland but grew up in Sweden, and is now a Swedish citizen. He turned professional in 1987 and despite several visits to qualifying school, did not win a place on the European Tour until 1995 when he graduated from the second tier Challenge Tour by finishing in 9th place on the end of season rankings in 1994. He won the Turespana Open De Canaria during his début season as he finished in 21st place on the Order of Merit and was named the Sir Henry Cotton Rookie of the Year.
In 1996, Sandelin played on the United States based PGA Tour, but made just one cut from 14 tournament starts during the season. He returned to Europe towards the end of the year with immediate success, winning the Madeira Island Open. He has won a total of five tournaments on the European Tour and his best season was 1999, when he won the Spanish and German opens and finished 9th on the Order of Merit. He also made his only Ryder Cup appearance that year, but was only selected to play in the singles and lost his match.