The Kingdom secured a 2-0 victory at home to Indonesia to win a record-breaking fifth title with a 3-2 aggregate.
The December 17 fixture, however, came under scrutiny after a small number of home fans lit flares to celebrate Sirod Chatthong’s first-half goal, ignoring an earlier warning that any type of misbehaviour could result in punishment for the home country.
The AFC notified the Thai FA of the sanction after its disciplinary committee handed down the hefty fine and also warned that a repeat incident could lead to a more severe punishment.
Thai FA spokesman Patis Supapong said the fine was the minimum punishment and such an incident could potentially lead to Thailand being suspended from hosting a future home fixture.
He asked for the cooperation of supporters to stay clear of trouble in the future.
“We worked really hard to explain to the AFC’s disciplinary committee that we’re serious about trying to sort out this problem. We gave them everything after we compiled all the information from police and the [match] organising committee as well as our action plan to handle the problem.
“Nevertheless, the AFC reiterated that should there be a repeat incident in the AFC or Fifa-sanctioned tournaments, we would face a more severe punishment than a fine.
“To prevent a repeat of problem in the future, the association, therefore, would like to ask for cooperation from our fans to comply with the rules in order to avoid receiving harsher sanctions,” Patis said.
It was the second time in four years that Thailand has been fined for crowd disturbance.
The country was hit with a Bt150,000 fine after fans lit flares in the stands during the Asian Cup qualifier against Lebanon, when they were beaten 5-2 at home in 2014.
In the aftermath of the incident, police pledged to bring those responsible to justice but have so far failed to do so despite issuing arrest warrants for nine suspects.