"The prosecutors will soon make a copy of the court verdict and pass it on to Britain to quickly extradite him," Seksan Bangsombun, chief prosecutor for the case, told reporters.
Thailand's Supreme Court said on Tuesday in a majority ruling that Thaksin had violated a conflict of interest law while in office and sentenced him to two years in prison.
The nine-member court ruled by five to four that Thaksin had got involved in his wife's purchase of land from a central bank fund.