He is aware of the increasing violence in the region but New Zealand's commitment meant going to help "became a personal responsibility".
Mr Sooden and three other aid workers from Christian Peacemaker Teams were taken hostage in 2005 by a group calling itself the Swords of Righteousness Brigade, now believed to have been a cell of al-Qaeda.
He and the two other surviving hostages were held for 118 days.
Yesterday, the 41-year-old said he was taking six weeks off his IT job in Grafton to travel to Iraqi Kurdistan.
"The risk of kidnapping and being killed is very low in Kurdistan. Relative to the risk in Iraq, it is very low.
"But, that said, Isis forces are staging attacks close to the capital."
Among his roles there, he would contribute to an art and story project for displaced and refugee children. He would also work on relationship-building between refugee and local communities, and with aid agencies.
Mr Sooden said the New Zealand Defence Force should not be part of an American-led coalition when United States policies "have had a devastating impact on Iraqi society".
Instead, he said New Zealand - as a United Nations security council member - should ask the UN to block the ability of Isis to wage war while increasing humanitarian aid and working to find a diplomatic solution.
He said the escalating conflict in the region was expected to increase the death toll on local communities caught up in the violence.