International Islam critic Ayaan Hirsi Ali is urging the New South Wales government to reconsider allowing Muslim imams inside Australia's first special jail for terrorists.

Corrective Services NSW has confirmed Muslim imams are likely to be allowed inside the new wing of the Supermax jail when the new $47 million complex opens.

However, Ms Hirsi Ali said this would be a mistake and could turn already radicalised inmates into a maximum security militia nightmare at Supermax II.

'Individuals who are going to these prisons are already sufficiently radicalised but sending imams there with them makes matters worse,' she told Daily Mail Australia from a secret location in the United States.

'You turn them from just being prisoners who committed terrorist acts to militias that can train and remain inspired in these prisons.'

The Somali-born writer and former Dutch lawmaker, who requires 24-hour bodyguards for speaking out about Islam, supported the NSW government's plan for a separate wing for convicted terrorists.

But she said the new prison should be about making them renounce their extreme Islamist views.

'They've had enough religion really and if you're going to put them in a prison aside from everyone else, they should be taught... about other ideas and how awful their set of ideas are, whether they listen or not,' she said.

'But not to reward them by giving them imams that further radicalise them and reinforce the terrible ideas that they already have in their heads.'

A NSW Corrections spokeswoman said it was 'committed to supporting the practice of peaceful, mainstream Islam'.

The NSW government is building a new wing for terrorists at the Supermax jail in Goulburn

Islam critic Ayaan Hirsi Ali has called on the NSW government to ban Muslim imams from jails

She added the new 'high-risk management correctional centre' for terrorists was likely to have the same Muslim imams as the existing Supermax prison at Goulburn, in the state's south.

'The same chaplaincy arrangements for HRMCC will apply at the new unit,' the spokeswoman said.

Supermax II will be Australia's first terrorist jail designed with soundproofing, audio and closed-circuit TV upgrades to help monitor visitors and prisoners to stop extremists influencing other inmates.

The plans were included in the Budget and also include boosting the number of prisoners in Supermax from 45 to 75 inmates, and offering a new deradicalisation program.

The new Supermax could house Khaled Cheikho, who was convicted over a major terror plot

Mohammed Omar Jamal is another convicted terror plotter who could be put in Supermax II

The NSW prisons system employs more than 40 full-time and part-time chaplains, along with religious instruction volunteers, but Ms Hirsi Ali says Muslim imams should be removed from all jails.

Supermax II is likely to house terror plot prisoners by the likes of Mohamed Ali Elomar, Abdul Rhakib Hasan, Khaled Cheikho, Moustafa Cheikho and Mohammed Omar Jamal.

They are among the 30 Muslim prisoners now locked up in the existing Supermax with the state's worst criminals, including serial backpacker killer Ivan Milat.

They were found guilty by a jury in 2009 of being part of a terror plot cell in Sydney and Melbourne four years earlier, which had planned an attack on Australian soil.

The men were arrested as part of Australia's biggest ever counter-terrorism operation.