Sri Lankan President Maithripala Sirisena has banned the groups National Thawheedh Jamaath (NTJ) and Jamathei Millathu Ibrahim (JMI) which are suspected of being behind the Easter Sunday blasts.
The president said in a statement that all movable and immovable assets belonging to the groups would also be seized.
Steps are also being taken to ban several other extremist organisations in line with emergency regulations, according to the president.
According to reports citing security officials, the NTJ is suspected of being the main group that carried out the attacks.
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Sri Lanka launched a criminal investigation immediately after the attacks and has reportedly already arrested over 100 suspects. According to prosecutors, nine suicide bombers carried out the terror attacks, eight of which have already been identified.