Indigenous, immunocompromised and other vulnerable children as young as 12 will be given priority access to Pfizer vaccines.
The jabs are approved for children aged between 12 and 15 if they are immunocompromised, have an underlying medical condition, are Indigenous or in remote communities.
Federal Health Minister Greg Hunt on Monday said this meant about 220,000 children would be able to get a Pfizer vaccine.
The rollout officially begins on August 9, but GPs are free to start administering vaccines to eligible children before then.
While the Therapeutic Goods Administration last month approved Pfizer for children, Australia's expert panel on immunisation had to give the final nod.
Australian Associated Press