The individual, who Police have not yet named, was taken into custody late last night on suspicion of breaking into a property, and sexual touching without consent.
It followed an appeal to islanders to get in touch if they had witnessed the man fleeing from a property in Maufant, St. Martin.
Pictured: The alleged sexual assault happened at an address in the area of Maufant, St. Martin.
Officers also provided photos of a hooded top and trainers left at the scene of the reported sexual assault against the young man, who received support at Dewberry House yesterday.
The suspect remains in Police custody while enquiries continue.