An order on setting up of the SIT was issued by the Union Home Ministry this evening, official sources said.
The team will submit its report within six months.
The three-member SIT will have two Inspector General rank IPS officers and a judicial officer. However, the names are yet to be announced by the government.
The SIT has been constituted following a recommendation of a committee, headed by former Supreme Court Judge Justice (retd) G P Mathur, which was set up to look into the possibility of re-investigation of the 1984 riots cases.
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3,325 people were killed in the riots. Of them, Delhi alone accounted for 2,733 and the rest were killed in Uttar Pradesh, Haryana, Madhya Pradesh, Maharashtra and other states.
BJP had earlier demanded re-investigation into all anti-Sikh riot cases.
The Justice Nanavati Commission had recommended reopening of only four of the 241 cases closed by police but BJP wanted the re-investigation of all the other 237 cases.