Wiltshire Police are appealing for witnesses after more than £100,000 damage was caused to buildings and equipment at the West Wilts Youth Sailing Association, in Westbury.
The suspect/s are believed to have entered the charitable trust's premises in Station Road between 8.30pm on Wednesday April 23 and 4am the following morning.
Two outboard motors from boats housed within one of the buildings were stolen along with other items of sailing equipment.
The building was then set alight causing widescale damage to the property and boats which were being stored nearby.
Anyone with information on this incident is asked to contact DC Jane Hughes at Melksham CID via 101 or Crimestoppers on 0800 555 111 where information can be left anonymously.