Warjiyo also repeated that the central bank's policy will be geared towards supporting an economic recovery and that interest rates will be kept low until there is an early sign of rising inflation.
The ministry said the sale was its eighth and final transaction for 2020, under a special agreement with Bank Indonesia, with the central bank relinquishing interest payments.
The baht fell 0.4pc to its lowest since June 1, and stocks gave up earlier gains to trade 0.2pc lower, after the Minister to the Prime Minister's Office Tewan Liptapanlop quit.
The Thai baht gained 0.4% as the dollar eased late in Asian trade after a generally tight session. Full percentage point gains for China and Indian shares helped pull stock markets higher.