Director of international students Alexandra Ferretti said the school had been talking about cancelling the trip "for a while" but didn't want to make a hasty decision.
"Listening to the community and listening to our homestays we thought it would be safer for everybody and better for the kids, the kids' welfare as well and safer for our community for them to stay in Thailand."
"We have got a group from Japan that was scheduled to come in the second week of term three, but there's not going to be any point in them coming now because they only come for eight days and obviously they would have to spend all that time in self-isolation so I think that will be cancelled as well," Ferretti said.
What you need to know
Ferretti said ensuring the safety of the students and community is number one.
"It's really important for our kids to have international experiences, but we've also got to think of everyone's safety.
"That's what we have at the forefront, if we can't guarantee 100 per cent that we can keep children safe we are going to cancel trips."