Most have since been reunited with their families, leaving 198 boys and girls when the facility in Colombo closed on Tuesday, the commissioner general of rehabilitation Brigadier Sudantha Ranasinghe said.
"These children will now be released to their parents," Ranasinghe told AFP.
A Sri Lankan court in February ordered the camp, the only one of its kind, to be shut.
"During my time at the camp I made friends and learnt it is OK to trust (majority) Sinhala people," said 17-year-old Lukshia, who spent three years with the female Tiger wing.
"I am sad to go, but happy I am going back to my family," she told AFP.
Ranasinghe said 49 boys and three girls opted to remain and continue their schooling at the Hindu College at Ratmalana, a suburb of Colombo.For 16-year-old Christie, the rehabilitation camp took him one step closer to his dreams of being a lawyer.
"I want to finish school. LTTE (Liberation Tigers of Tamil Eelam) is finished now. People won't come and take me to fight again," said Christie, who was forcibly conscripted at the age of 14 by the Tigers, or LTTE.
Around 12,000 Tiger rebels surrendered to security forces, while others were arrested from among nearly 300,000 war-displaced civilians who were held in internment camps during the final stages of fighting.
Captured former rebels are being trained in professions including plumbing, carpentry, driving and hairdressing.
A major military onslaught crushed the Tigers in May last year, ending 37 years of violence that had claimed up to 100,000 lives, according to the United Nations.
The Tamil Tigers were widely criticised for using child soldiers in their unsuccessful battle for an independent homeland for the island's ethnic Tamil minority.