The Hampden league life member is stepping down from her role as Koroit's open grade coach but will continue to contribute to the game in other ways, including umpiring.

O'Sullivan, who guided the Saints to their Hampden league three-peat in 2019, has announced she has relinquished the top job.

She said there were a couple of reasons she decided to step down.

"My family, we're building a new house next year," she said.

"And obviously with COVID-19, my business is my main priority as well.

"I've got 20 staff so we need to make sure it's up-and-running at full capacity again next year.

"To do a coaching role you need to be 100 per cent committed and I just felt I probably couldn't commit that next year."

The O'Sullivans live at Illowa but have bought a block in Koroit.

The mother-of-four also manages Port Fairy Day Spa, a family business established in 2004.

O'Sullivan, who became coach at the end of 2018, had hoped to coach two full seasons so was disappointed 2020 was ruined by the coronavirus pandemic.

"Yes, I was actually," she said.

"Because I probably knew I could do just two years and I knew we'd probably look at building (the house) that year (2021).

"It was disappointing this year didn't go ahead but I understand the health of the community has to come first and we're just in extraordinary times."

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O'Sullivan also coached the Saints about 15 years ago.

She won 10 HFNL flags as a player, seven of which were with Koroit.

The 2019 premiership mentor is looking forward to watching more of her kids - Jack, Paddy, Finn and Shelby - play footy and netball.

She'll also continue to contribute to the club in other ways.

"I will umpire, there are obviously not a lot of umpires around so I will do my part for the club, when needed," she said.

"I'm on the junior and senior committee so I'll stay on those committees."

O'Sullivan is passionate about helping young netballers develop.

Isabella Baker, who at 16 was runner-up in the 2019 league best and fairest, was among her shining lights last year.

"I love it, it just brings so much joy," O'Sullivan said.

"The younger players, they're still understanding the game and still developing their own style.

"I really enjoy seeing different players and how they think about the game.

"It's always intrigued me, the psychological side of things.

"Juniors are very interesting players and they're eager."

O'Sullivan said she had been blessed with a great playing group.

"I thoroughly enjoyed coaching them, it's a shame I haven't got the time to put in," she said.

"But I'm sure I'll be around and will really enjoy watching them."

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