The Swede carded rounds of 69, 64 and 67 to take the title on -10 by a single shot at Golf Club Bad Ragaz.
It was an emotional win, coming more than four-and-a-half years after his breakthrough on the Legends Tour when he won the 2019 MCB Tour Championship after a final round of seven under par, 18 years after his last on the DP World Tour, in a year where he also won the 2019 Farmfoods British Par 3 Championship.
He is a five-time winner on the DP World Tour and was also a member of the European Ryder Cup team at Brookline in 1999.
Having turned pro in 1987, he would have to wait until 1995 before he played on the DP World Tour following a host of failed attempts to gain his card through Q-school.
He won the Open de Canaria in his maiden season on Tour and would be named the 1995 Rookie of the Year.
Sandelin had a notable performance at the Black Desert NI Legends 2025, where he finished tied for 18th place with a score of 213 (−3).