Roj Dalisay was charged with sexually assaulting a student multiple times between 2020 and 2021 while working at Mount Carmel Catholic College at Varroville, in Sydney's southwest.
Police arrested the 28-year-old about 12.30pm on Tuesday following extensive inquiries by detectives from Campbelltown beginning in July 2023.
He has been charged with three counts of aggravated sexual assault on a victim under his authority and a further count of aggravated sexual touching of another person.
Dalisay was granted bail on Wednesday after Burwood Local Court heard he had no criminal history and had been co-operative with police during his arrest.
His lawyer, Edward Cullen, said the teacher had not been accused of committing any offences since 2021.
Magistrate Christopher Halburd noted Dalisay had limited community support but he had the backing of some family members, including a father who attended the bail hearing.
"The risks are not unacceptable," the magistrate said.
As part of his bail conditions, Dalisay is required to report to Muswellbrook police station twice daily, surrender his passport and make a deposit of $15,000.
His case is scheduled to return to court on November 6.
The Catholic Education Diocese of Wollongong, which oversees the co-educational school, said the police investigation followed a report from the Catholic Education Office.
"The (office) and Mount Carmel Catholic College have been assisting police with their investigations - including by co-ordinating the provision of support, the standing down of the employee and other actions taken by the college in relation to this matter - and will continue to do so," a spokesman said in a statement.
Additional support was being made available to staff and students at the school, he said.
1800 RESPECT (1800 737 732)
National Sexual Abuse and Redress Support Service 1800 211 028
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