She met a woman in Uttarakhand's Kathgodam and married her.
As far as the hapless wives are concerned, when the girl from Kaladhungi came to know that Sen was not a man, she silenced her by promising money.
Sen, who was at large, was traced by Kathgodam police and arrested on Wednesday. She told the Uttarakhand woman, identified as Kamini, that she was the son of a businessman from Aligarh, said the police. The woman identified as Krishna Sen, alias Sweety Sen hailed from Uttar Pradesh's Bijnor district. Meanwhile, Sen married her "second wife", who was from from Kaladhungi, in April 2016.
Police say Ms Sen had the numbers of more than 200 women in her phones, and was actively conversing with women across the country on a range of social media platforms.
According to the police, the con woman had come to Kathgodam to meet a woman she had become acquainted with on Facebook. She also reportedly posed as a man in her pictures to seem convincingly masculine to other women.
Senior police officer Janamejay Khanduri told the BBC that while initially they failed to comprehend what Sen was saying, a medical examination conducted later revealed that Sen was actually a woman.
The Indian woman managed to maintain her illusion by cutting her hair short and wearing men's attire. She alleged that Sen took $850,000 rupees (US$13,243) from her family, claiming she needed the money for a factory she owned in Hardwar. "I don't want to live with her now".
Nonetheless, Sweety was originally charged with dowry harassment, but later on, police confirmed that they modified the complaint as none of the two unions qualified as marriage. However, the perceived marital bliss ended when Sen began assaulting the woman for her dowry, police allege.
Another victim Nisha said, "We were married for two years, I found the truth about her later".
"Krishna has been booked for forgery and not for dowry". "Sen had convinced her that she was a man".
Police said they are on the lookout for Sen's family, who were present during both the weddings and allegedly visited the homes of the two duped women.