Arjuna Mahendran, whose term was to end on June 30, will stay away from his job until Parliament's Committee on Public Enterprises (COPE)investigate him in the issuance of Treasury Bonds issue, the Information Department said in a statement.
Mahendran was handpicked by Prime Minister Ranil Wickremesinghe to be the bank chief when President Maithripala Sirisena won the presidential election defeating Mahinda Rajapaksa in January 2015.
Another scandalous deal involving the firm was reported in March this year.
Since then, Mahendran was under constant public pressure with opponents demanding his removal.
Wickremesinghe was also accused of protecting him.
Sirisena in a public speech a year ago had expressed unhappiness over Mahendran's conduct.