A Sydney man is facing an additional 37 charges over the alleged sexual and indecent assault of students at a dance studio.

The extra charges against Grant Davies have been laid after more students of the RG Dance Studio came forward.

The 39-year-old was the co-director of the school at Chiswick in the city's inner west, before he was arrested in May and charged with a string of child sex and grooming charges.

On Tuesday the extra charges were laid, including 14 counts of aggravated sexual assault, 18 counts of aggravated indecent assault and four counts of aggravated indecency.

He has now been charged with 47 offences, with the alleged victims being aged between nine and 14.

Davies faced Burwood Local Court this morning, where the case was adjourned until September 9.

Grant Davies' sister, Rebecca Davies, closed the RG Dance Studio a week after her brother was arrested.

Burwood detectives are still asking for anyone with information that may assist their investigation to come foward.