Park carded a one-over 74 in the final round to finish on 14-under for the four rounds ahead of American Amy Olson at the Royal Adelaide Golf Club as many players struggled in challenging winds.
Hannah Green was the best placed Australian in a tie for 13th at six-under while Minjee Lee was two shots further back in tie for 25th.
A strong contingent of Korean fans cheered Park to her 20th LPGA win and her first Australian Open title.
South Korean players are no strangers to success in the South Australian capital with Ha Na Jang winning at Royal Adelaide in 2017 and Jin-Young Ko at Kooyonga Golf Club in 2018.
Park said the strong crowd support and the national open victory had made Australia a lucky place to record her 20th LPGA win.
It’s a special place to reach that position because I have so many of my fans and supporters are from Australia,” the 31-year-old said.
“I was really surprised how many fans came out to watch this week. I was really thrilled to see them and the golf course was just in pristine condition. It’s one of the best I’ve played.”
The win is Park’s first in almost two year’s and could not come at a better time for her.
The world No. 17 is the reigning Olympic Gold medallist but is no certainty to win a place on this year’s Olympic team as there were five other South Koreans ahead of her in the world rankings going into the tournament.
I think it’s really the joy that I am feeling and the relief, I guess, because I just didn’t know when it (the 20th victory) was going to come – it took almost two years.
“I have been missing them quite a lot. So, yeah, really good to have the trophy again.
“Nothing is really going to change this year, it’s a very important year. To make the Korean National Team is not the easiest task and this win might not do it yet, just yet, so I’ve still got to play really good golf.”
The ISPS Handa Women’s Australian Open has been played in the South Australian capital Adelaide since 2016 on a rotation between The Grange Golf Club, Kooyonga and Royal Adelaide. Next year’s event will be held in February at Kooyonga just a few kilometres from Royal Adelaide.Jump to next article