The video shows her stopping and bending down to look at something, before she appears to wrestle with the shark and picking it up in her arms.
Desperately wanting a safe swim, Melissa Hatheier was filmed wrestling with the unexpected guest at the Cronulla Beach rock pool.
"He was pretty distressed and bumping into things, so I just followed him around for a bit".
The shark was a Port Jackson shark, said to be harmless to humans.More news: Jurgen Klopp told to build Liverpool FC defence worthy of Philippe Coutinho
"I jumped in and I thought, 'I reckon I can probably get him out.' And mum called 000, so the police came down as well".
The clip was captioned, "Our in house Shark Wrangler Melissa Hatheier wrestling a shark out of Oak Park Rock Pool yesterday morning!" She joked while speaking on the show that "As a real estate agent I'm used to relocating people and this was similar". "I just dived on him".
"I wasn't scared. I was just thinking he was trapped in this rock pool and I needed to help him out". Hatheier felt sorry for the shark and made a decision to be a good Samaritan.
I wouldn't have done it with a great white.I thought, as long as I keep my hand near its fins it couldn't bite me; I wouldn't have grabbed it by the tail though.
Her video, since being posted on October 10, has collected over 1.3 lakh views, some 1,200 reactions and more than 1,000 shares.