Sen's associate Debjani Mukhopadhyay has also been sent to Kolkata police custody by the court, till June 11.
"The police custody is on the basis of a case filed against them in Lake police station by an agent for duping the agent and the investors of their money, " Joint CP (Crime) Pallab Kanti Ghosh told reporters here.
Ghosh added that a total of seven cases has been filed against the Saradha group in various police stations under the jurisdiction of Kolkata police.
Yesterday Sen, Mukhopadhyay and another official of the company were sent to judicial custody till June 3 in cases related to cheating by a court at Baruipur in South 24 Parganas district.
Meanwhile, the Bidhangar police today questioned Matan Singh, the person who has been named by Sen in his letter to CBI.
Singh, however, after coming out of the interrogation room claimed that he was here to cooperate with the police.