The forum aims to boost collaboration between police and government officials in preventing IED attacks, and comes just weeks after an explosion at a Bangkok shrine involving an IED killed 20 people.
Brandis said societies now "live in an age more dangerous than we had ever imagined before... Where extremist groups operate without regard for national boundaries and have a footprint in most countries, including our own".
The nation's first law officer said the conflict in Syria and the activities of jihadist groups such as Islamic State showed the changing nature of terrorism and a shift in tactics, from large-scale September 11-style attacks to smaller, "lone wolf" plots.
"As well as our efforts to stem the exodus of would-be foreign fighters (to the Middle East), we should be prepared for more of these types of attacks in Australia," he said.
In December last year, an Iranian-born extremist Man Haron Monis carried out a 17-hour siege in a cafe in Sydney's central business district, resulting in the deaths of two hostages and the gunman.
The government says some 120 Australians have left to fight in Iraq or Syria with 160 actively supporting extremist organisations at home through financing and recruitment.
Interpol said yesterday that urgent action was needed as the threat of terrorism had reached "unprecedented heights".
Recent incidents include the Thailand shrine explosion, a mosque bomb attack in Saudi Arabia that killed 15 and an attack on a cultural centre in Turkey where more than 30 people died, Interpol said.
