The Joeys came from behind to beat Vietnam 2-1 and book their spot in the AFC U-16 Championship 2020 Finals on Sunday night.
The two teams were tied on nine points at the top of Group H heading into the fourth and final clash of the qualifying.
And Vietnam's superior goal difference meant that Australia required a win over their opponents to finish in top spot, and secure an automatic qualification to the 2020 tournament.
The Southeast Asian side held a 1-0 lead at half time courtesy of Nguyen Cong Son's excellent effort from outside the box in the 19th minute.
Feature imaged thanks to the Vietnam Football Federation
But Trevor Morgan's side rallied, and equalised when Bernardo Oliveira dispatched a 58th minute penalty following a foul on Thomas Lopez.
And with full time approaching, Luka Smyth fired in the winner after pouncing on a defensive lapse from the Vietnam defence.
The 2020 AFC U-16 Championship serves as the qualification tournament for the 2021 FIFA U-17 World Cup, with four nations set to advance from that tournament as Asia’s representatives at the prestigious world youth competition.
REPORT: Joeys win to set up AFC U-16 Championship qualifying group decider
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REPORT: Joeys continue strong start to AFC U-16 Championship qualifying
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