Newcastle Police spoke with the man at his house in Kendall Street, Charlestown, at about 6.50pm on Saturday.

A police statement said the man had "just returned from a pub where he had been drinking, despite being directed to self-isolate for 14 days after returning to Newcastle from Victoria on Monday, July 13".

The fine was part of a police operation across the state that led to action against numerous people and venues.

The action relates to alleged breaches of the state's public health orders, established in response to the coronavirus pandemic.

Twelve people each received a $1000 fine following a large outdoor event in bush near Lake Jindabyne on Friday.

About 11.30pm, police were called to the area and observed a large, organised dance party attended by 150 to 200 people.

Monaro Police issued fines to eight men in their 20s and early 30s, and four women in their 20s.

A 63-year-old Victorian resident was arrested after driving into NSW via the Cobb Highway Bridge, which links Echuca in Victoria and Moama in NSW.

The man allegedly refused to provide police with identification or a permit to enter the state, stating he was a "sovereign citizen".

He was charged with failing to comply with a direction under the public health order.

The man, from Fyansford near Geelong, was ordered not to re-enter NSW without a valid entry permit or exemption.

He is due to appear in Moama Local Court on Wednesday.

Monaro Police attended a venue in Thredbo about 4.30pm on Saturday and observed a number of alleged breaches to the Public Health Act.

"This included a breach of capacity limits for the size of the venue, including people waiting in line and not physical distancing, more than 10 persons seated per table, no COVID-safe marshals and patrons not seated while socialising," a police statement said.

Police spoke to the licensee about the issues. Officers returned an hour later, observed further breaches and people running away.

The licensee was issued with two $5000 fines. A travel company owner who had organised for a large number of patrons to attend the venue was issued with a $5000 fine.

Wollongong Police inspected a licensed premises on Saturday afternoon on the Princes Highway in Figtree, where they allegedly observed a large number of patrons standing together and drinking in groups.

Police allege the venue manager did not properly enforce the COVID-19 safety plan. The venue will receive a $5000 fine.

Mid North Coast Police conducted 19 audits of hospitality venues across the Port Macquarie-Hastings Council area on Saturday, issuing three fines to venues for alleged breaches of the public health order.

This involved a $1000 fine to the licensee of a venue on Rollands Plains Road at Telegraph Point, after patrons were seen "standing and consuming alcohol and not physical distancing, and because there was no COVID safety plan or COVID safety marshal present".

Two restaurants, on Clarence and William street in Port Macquarie, will each receive a $1000 fine after they were caught allegedly not complying with a direction.

Lake Illawarra Police inspected hospitality venues on Saturday, issuing fines to four of the seven venues visited.

These include restaurants and hotels in Gerringong and Shellharbour, who were allegedly breaching the public health orders.

The alleged breaches included being overcrowded, not enforcing physical distancing, not having COVID safety marshals present and breaching COVID safety plans.

Licensing police also closed a venue at Dapto "in order to avoid breaches". Two arrests were made in the process for offensive conduct and failing to comply with a reasonable direction.

Anyone who has information regarding individuals or businesses in contravention of a COVID-19-related ministerial direction is urged to contact Crime Stoppers on 1800 333 000 or at nsw.crimestoppers.com.au.

The public is reminded not to report crime via NSW Police social media pages.