A physiotherapist indecently assaulted six patients after convincing them it was a legitimate treatment for him to massage their breasts, a court has heard.

Father of two Youngjin Jung had his bail revoked after a hearing in which he told the court he knew he was breaking the law but could not stop himself.

The 36-year-old previously pleaded guilty to seven counts of indecent assault, committed at a physiotherapy practice at Umina in 2014.

The court was told he massaged the women's breasts and, on one occasion, a woman's genitals.

During a sentencing hearing in the New South Wales District Court Jung apologised to his victims.

"I am really sorry to all six ladies and their families," he said.

"There is no excuse for what I did."

Under cross-examination from crown prosecutor Tanya Bright, Jung acknowledged there was no legitimate reason for the massages.

"The reason is you were sexually attracted to your female patients isn't it?" Ms Bright asked.

"Yes, that's right," he replied.

"And as a consequence ... you acted on your sexual interest while they were in treatment?"

"Yes, that's right."

The prosecution described the crimes as a breach of trust and "quite calculating" because Jung had tried to reassure the victims during the assaults by asking "is this OK?"

Physio 'stressed' at time of offences

Jung told the court he had been under significant stress at the time, juggling a master's degree with the upcoming birth of his second daughter.

He also said he was socially isolated in Umina

"I didn't have a social life. There's not many Korean people around there so I just stayed at home," he said.

His barrister, Benjamin Pierce, asked the court to consider his client's Korean background when deciding on a prison term.

"In jail he's unlikely to be able to associate with people from his cultural background," Mr Pierce said.

"He won't have that opportunity because essentially people from Korea aren't in jail," he said, tendering a copy of a prison census report.

Mr Pierce said his client's cultural isolation in prison could be detrimental.

However, Judge Clive Jeffreys dismissed the argument, noting that Jung speaks English.

"From time to time, the court takes into account that the accused is a foreign national who can't speak English but that doesn't apply in this case," he said.