Tourist police arrested a Russian man and a Turkish man for working without permits on Koh Phangan on Thursday.
A 34-year-old Russian was arrested in front of a restaurant while installing CCTV and audio-visual systems.
Police seized CCTV cameras and tools from him.
He told police that he was employed as a marketing manager. His employer also gave him extra work in audio-visual installations.
Meanwhile, a 45-year-old Turkish man was arrested at a shop while using a drill to install electronic devices. He said he accepted the job because his employer promised him a share of the business.