Authorities had blocked their participation in the Kalachakra teachings given in India by the Dalai Lama.
Tibetan residents of western Chinese provinces pray, share teachings in spite of official threats.
Many fast or pray in private gatherings to avoid scrutiny by the police.
Tibetans living in China are warned not to spread news of the event online or organize gatherings in support.
Many were told by Chinese officials their families would be harmed if they failed to return home.
Villagers attempting to stop the assault were also attacked, local sources say.
They had come to Larung Gar from other parts of China and from Europe and the U.S. to study Tibetan Buddhism.
The group will be resettled in a temporary camp in Qinghai province's Golog prefecture, a local source says.
Destruction at the once bustling Buddhist study center has turned it into a 'dusty valley,' one source says.
Sonam Yarphel had staged a solo protest in Sershul calling for Tibetan freedom and the Dalai Lama's return.
The former Kirti monk was carrying a photo of the Dalai Lama and shouting slogans when he was overpowered by police.
Senior monks from the nuns' former Buddhist study center check on their condition, give religious teachings.
Authorities had demanded they say that Tashi Rabten had died not in a protest but because of a family dispute.
Removed from the Buddhist study center that was their home, they now live crowded into metal huts.
Chinese police questioned and detained family members following the protest, local sources say.
Anyone wanting to study Tibetan Buddhism there must first pass a political examination, and must be a monk or nun.
The protest brings to 146 the number of self-immolations by Tibetans calling for freedom in China.