Police will allege the man sexually assaulted six boys who were left in his care at religious youth groups in Nowra, Bomaderry, Sussex Inlet and Kings Cross between 1968 and 1990.

The man, who can't be named for legal reasons, left NSW in 1994 and now lives in Queensland.

Following extensive investigations by South Coast Police, the 68-year-old former youth worker was issued a court attendance notice on June 10 for 33 offences including buggery, indecent assault, sexual assault and incite an indecent act on a person.

The charges include seven counts of sexual intercourse with a victim aged under 16.

Those charges relate to alleged events at Bomaderry between January 1, 1987 and December 31, 1988.

Another fours charges, of committing an act of indecency while committing sexual assault, are the result of allegations the man "spooned" his victims from behind and rubbed his erect penis on their backs.

The acts allegedly took place in a tent at a group camping event.

The man faces another seven charges of inciting a person to an act of indecency while committing sexual assault.

Those charges relate to allegations the man incited multiple victims to apply cream to his genitals.

Two charges of buggery against one victim at Bomaderry in 1968 and in 1970, were also outlined in court documents.

The original complainant alleged he was sexually assaulted by the man multiple times. Another five of the man's former charges came forward during the police investigation.

The man did not appear as expected in Nowra Local Court on Monday, with Magistrate Lisa Viney commenting this was likely due to the Queensland COVID-19 lockdown.

The matter was adjourned, with the accused due to appear in Nowra Local Court on September 27.