Surat Thani Governor Witchawut Jinto and Koh Samui Pol Maj-Gen. Apichart Boonsriroj announced on Sunday.
Pol Maj-Gen. Apichart said 2 cars, gold necklaces, 2 luxury wristwatches and 10 bank accounts have been seized.
The arrest of Mr Sompong followed two crackdowns on drugs on the resort island last year. The investigators pointed to a man known as “the boss” a key figure in the network.
Investigators later determined “the boss” was 63-year-old Sompong Ruangsri. Authorities said he operated rental van service which they believe was a cover for his drug business
The authorities did not give further details on the suspect’s arrest on Koh Samui, Thai media reported.
Pol Maj Gen Apichart said Mr Sompong had been convicted on heroin charges and assets worth bt10 million were seized in 2002. After being released from jail in 2011, the man set up a new drug network on Koh Samui.
The Surat Thani police chief suspected he had connections with influential figures and officials. A Koh Samui court approved an arrest earlier this year.
Surat Thani Governor Witchuwut Jinto said any officials found to have links with the gang will face stern action.