The experienced Japanese defender is bound for the Thai Premier League club as they embark on a new project
Goal understands Moniwa, 32, will form part of the new-look Bangkok Glass under head coach Atthapon Buspakom, who has joined the club from Buriram United.
Long-serving right winger Saruta Hironori is also set to leave Bangkok Glass as part of the changes.
Moniwa has represented Japan nine times, including an appearance at the 2006 FIFA World Cup.
Subara meanwhile is now a free agent after leaving what was his fifth different club in the last four years.