There will be designated entry and exit points at each beach.
The mayor said the"swim and go"and"surf and go"measures were strictly for Waverley residents and people from further afield were unwelcome.
"Our beaches remain closed to all land-based activities including social gatherings,sunbaking,walking and jogging,"Ms Masselos said on Monday.
The partial reopening of the beaches comes as NSW recorded just two new cases of coronavirus after 4400 tests were conducted on Sunday. Premier Gladys Berejiklian said COVID-19 restrictions will be eased in stages,with rollbacks to be announced twice a month.
"This position of control exists in very few places in the world and it comes down to the number of tests we've done,the number of things we've put in place,now it is time to look at what we can ease and we are definitely in that space,"Ms Berejiklian told 2GB on Monday afternoon.
"I would tend to think a couple of times a month you will get an indication of what you can do."