Southern Highlands Police have put accommodation providers on notice.
Police officers have reminded owners that it is an offence to promote holiday stays during the COVID-19 pandemic, as the Easter long weekend draws closer.
Accommodation is still available for emergency services or for those doing essential travel.
Businesses that promote holiday travel face $5000 fines, while individuals face $1000 fines.
Southern Highlands Police officer-in-charge Inspector John Klepczarek said police wanted to stop Sydneysiders and other holidaymakers coming down for the Easter long weekend.
"We're discouraging businesses to promote themselves as being open and available for Easter long weekend stays," Inspector Klepczarek said.
"This is also goes to Airbnb because that's a business.
"If people need accommodation for a reason under the public health act, they can stay because they obviously need it.
"[However] weekend getaways aren't allowed and go against the advice issued."
Inspector Klepczarek said the restrictions were put in place to protect the community.
"We appreciate and understand this is a tough time for all businesses, especially the hospitality industry but the health and safety of our community is paramount," he said.
"We don't want to put them at risk with businesses trying to make some money over this long weekend."
Southern Highlands Police will target popular tourist destinations, including Berrima, Bowral, Bundanoon and Burrawang.
Officers will also ensure people are abiding by COVID-19 restrictions.
"For the first time we'll be proactively approaching people asking what they're doing on the streets," he said.
"People should not be standing in parks or loitering in front of takeaway stores. Do your business and get home.
"Don't be offended if you're chatting with someone, even if you're keeping social distancing and you're asked why you're out.
"We're doing a fabulous job in the Wingecarribee Shire of trying to contain this virus. We've come this far and we need to continue."