Police are investigating whether a sexual assault in Box Hill South is related to a string of attacks in the south-eastern suburbs believed to have been carried out by one man.

A woman was walking along Canterbury Road near Station Street just before 3pm yesterday when when a man approached her and indecently assaulted her, before walking off to the west.

The victim described him as Asian in appearance, aged 25 to 30-years-old with short black hair. He was wearing black sunglasses, a grey t-shirt and dark pants.

A police spokeswoman said investigators are trying to determine if the incident is linked to a spate of nine previous sexual assaults in the eastern suburbs over the last few months.

All those have assaults have been carried out by a man fitting a similar description to that of yesterday's perpetrator.