The cars were reportedly ordered by buyers in Laos and smuggled across the border.
Crime Suppression Division chief Pol Maj-General Jirabhop Bhuridej said police have been monitoring the syndicate for six months and learned that the smuggling operation was run by two groups located in Mukdahan, Ubon Ratchathani and Sakon Nakhon.
Police also learned that the smuggling operation had been running for three years now, and are checking to see if any government officials may have been involved.
Five persons have been arrested in Thailand, while one, who allegedly financed the operation, was arrested in Laos.