Fines can be issued to travellers who have returned from overseas and do not follow self-quarantine for 14 days and those diagnosed with COVID-19 who similarly don't follow the rules.

The penalties also apply to mass gatherings and social distancing rules, and the closure of social gathering places.

Inspector Greg Flood of the South Coast Police District said police had increased their presence in CBD areas.

"There's high visibility policing in particular supermarkets and Centrelink - they are a focus in the community," he said.

So far, Inspector Flood said people were being compliant.

"There has been no issues at those centres; people are behaving and complying with what those centres are asking them to do," he said.

"We will continue with patrols to make sure people are following guidelines in those areas."

Inspector Flood said reports of people returning from overseas and not following self-isolation rules were common in the district.

"Police are attending reports of non-compliance locally, however we are providing these places or people with up-to-date information or guidelines as provided by ministerial authority and NSW Health," Inspector Flood said.

He said police were taking "a reasonable approach to the compliance guidelines".

"We are working with the community to ensure everyone is on the same page," he said.

"We are providing directions from NSW Health both verbally and a hard copy.

"There have been no reports of ongoing non-compliance once provided with the information.

"We all have a role to play - our role is to make sure the community makes it through to the other side."

He urged the community to stay up-to-date with COVID-19 information and advice on the NSW Health website.