"We want to study how the US handled terrorist suspects, particularly hundreds of them from the Al-Qaeda network, after the 9/11 attacks in New York," Godakanda told AFP.
Sri Lankan officials estimate 15,000 former rebels are detained in camps alongside hundreds of thousands of war-displaced civilians.
The Tamil Tigers, who fought for a separate homeland from 1972, were defeated by Sri Lankan troops in May when the military killed their leader Vellupillai Prabhakaran.
"Some of the former fighters will face prosecution for their crimes, depending on the evidence. Others will be sent for rehabilitation," Godakanda said.
Sri Lanka has sought foreign cash for an ambitious plan to rehabilitate many former rebels and has already collected 23 million dollars towards the