The budget carrier will initially acquire the planes from its parent company and the aircraft will be reconfigured in a new layout, SIA said in a statement but gave no further details.
"The B777-200's proven versatility and reliability are key deciding factors in the selection of the aircraft," SIA said in the statement.
"The B777 family of aircraft has been a mainstay of the Singapore Airlines fleet since its introduction in 1997."
As of July, SIA's 106-strong fleet includes 35 Boeing 777-200 aircraft, according to its corporate website.
SIA had announced in May it will launch the new budget airline using wide-body aircraft to tap into growing consumer demand for low-cost travel over longer distances.
The airline has said the budget outfit will be operated independently and managed separately from its parent.
Copyright AFP (Agence France-Presse), 2011