Their coach is also receiving monk’s orders. One of the boys is not joining the ceremony as he is a Christian, BBC reports.
The group will spend nine days living in a monastery, a tradition for males in Thailand who experience adversity.
They were trapped for more than two weeks before a dramatic rescue.
The boys were all released from the hospital last week and are said to be in good health after their ordeal in the snaking caverns of the Tham Luang caves of northern Thailand.
This step is intended to be a “spiritual cleansing” for the group.
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“They should spend time in a monastery. It’s for their protection,” Seewad Sompiangjai, grandfather of Night, one of the rescued boys told the BBC earlier. “It’s like they died but now have been reborn.”
Thai officials said the boys start the process by having their heads shaved, before attending a robe ceremony on Wednesday.
They will stay in different monasteries until 4 August meditating, praying and cleaning their temple. The length of time they will spend doing this – nine days – is a nod to a Thai lucky number.
One of the boys, Adul Sam-on, will not be joining the rest of the “Wild Boars” football team as he is a Christian. Their coach Ekkapol “Ake” Chantawong, 25, will join them for the same period of time but as a fully fledged monk rather than a novice.
The coach had spent time in a monastery as a novice before this. Although he has attracted some criticism for taking the boys into the cave, he is also credited with helping them through the ordeal by reportedly teaching them meditation techniques to help them stay calm and use as little air as possible.
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