Australia high commissioner to PNG, Bruce Davis, said the initial deployment would assist the Australian military with its response.
Prime Minister James Marape had earlier offered to send 1000 soldiers and firefighters.
Marape said Australia was the closest friend of PNG and was always the first to help in times of adversity.
The deployment of 100 PNG Defence Force personnel will cost the government just over $1 million, the Post Courier newspaper reported.
PNG Defence Minister Saki Soloma said 76 of the team would be from the engineering battalion in Lae, while the remaining would consist of field engineers and support staff from the Taurama based battalion.
A Royal Australian Airforce Hercules was scheduled to arrive in PNG at the weekend to collect the team before returning to Australia today.
Soloma said the immediate task would be to work alongside Australian counterparts in clearing roads and bridges blocked by fallen trees, so that firefighters could reach affected areas.