He submitted his resignation to the Chief Minister and sought an independent and impartial probe into the allegations, an official communique said here.
Soren, who assured him an impartial probe into the charges, recommended his resignation letter to Governor Syed Ahmed for acceptance.
The police are investigating the alleged links of the minister with JT after the arrest of its head Raj Kumar Gupta and four others on September 1 in Hazaribagh district.
Congress had also formed a three-member committee to look into the allegations against Sao, a party MLA.
Sao has since denied the allegations.
