The Victorian court on Thursday found three men guilty of planning a terrorist attack on an Australian army base in Sydney.

According to ABC News, the men in Melbourne of Victoria planned to kill as many people as possible in a shootout at the Holsworthy Army Barracks, in reaction to Australia's involvement in the wars in Iraq and Afghanistan.

Wissam Mahmoud Fattal, 34, Saney Edow Aweys, 27, and Nayef El Sayed, 26, have been found guilty of conspiring to prepare for or plan a terrorist act.

Another two men who also stood trial over the alleged planned attack have been found not guilty.

The Australian Federal Police tapped the men's phones for six months leading up to their arrests in August last year during raids across Victoria.

Hundreds of intercepted telephone calls, many translated from Arabic or Somali, formed the basis of the prosecution's case.

A Victorian Supreme Court's jury heard the men took steps to obtain a religious decree to endorse the attack on the barracks and shoot as many people as possible until they were killed or overwhelmed, to advance Islam.

Justice Betty King remanded Fattal, Aweys, and El Sayed in custody. They will appear in court for a mention hearing on January 24.