The seamer missed the entire Ashes and then sat out the recent three-match T20I series in Pakistan, and will now delay his departure to Sri Lanka ahead of the global tournament that kicks off on 7 February.
Glenn Maxwell, Nathan Ellis and Tim David are set to join the squad in Colombo on Tuesday with a warm-up fixture scheduled against Netherlands on Thursday.
Sean Abbott has been added to Australia's World Cup group as a travelling reserve to cover for Hazlewood and Ellis, who has just recovered from injury.
Australia selector Tony Dodemaide said: "We felt with Josh it was more practical and beneficial for him to continue his rehabilitation at home in a familiar environment before travelling to Sri Lanka.
"With Nathan also completing his return to play we decided to bring Sean with us as fast bowling cover should anything come up at short notice.
"Sean is an accomplished and versatile international player who has experienced numerous World Cup campaigns. It made sense for him to stay with the group following the Pakistan tour."
The Aussies have already suffered a blow when Pat Cummins was ruled out of the T20 World Cup due to his back with Ben Dwarshuis named as a replacement.
Australia squad for T20 World Cup: Mitchell Marsh (captain), Xavier Bartlett, Cooper Connolly, Tim David, Ben Dwarshuis, Cameron Green, Nathan Ellis, Josh Hazlewood, Travis Head, Josh Inglis, Matt Kuhnemann, Glenn Maxwell, Matt Renshaw, Marcus Stoinis, Adam Zampa, Sean Abbott (travelling reserve)
The ICC has warned the Pakistan Cricket Board of "long-term implications for cricket in its own country" if the national team boycott's the game against India at the T20 World Cup.
Quinton de Kock praised Ryan Rickleton's ability to adjust to the No 3 role and believes the rest of the lineup will need to show similar levels of adaptability if the Proteas are to win the T20 World Cup in India.
David Miller has been declared fit to join the Proteas squad ahead of their departure to the T20 World Cup after recovering from an abductor muscle injury sustained during the SA20.
Australia suffered a blow ahead of the T20 World Cup after Pat Cummins was ruled out of the global tournament due to his back injury.
