A Beit Din cannot force anyone to get married. The marriage must be "the joint voluntary actions of the man and the woman."
A Jewish wedding is a ceremony rich with layers of halacha and spiritual meanings and traditions. At the core of traditional Jewish marriage is the constitutive act of a marital relationship – the Maase Kinyan (literally 'Act of Purchase'): The man gives the woman a wedding ring and says to his bride in front of two witnesses, 'Behold, you are consecrated unto me by this ring, according to the law of Moses and Israel.' The marriage is thus constituted by the woman‘s willing acceptance of the ring. Similarly, a divorce is concluded by the willing transmission of a Get (deed of divorce) by the husband to his wife and her willing acceptance of the Get.
The validity of a marriage or a divorce depends entirely on the joint voluntary actions of the man and the woman. For this reason, the Batei Din adjudicates the validity of a marriages and divorces as questions of fact, but they cannot dissolve a marriage through an act of the court. Even in situations where a couple is under obligation to divorce because of some fault of one of the partners, all a Beit Din can do is order the husband to divorce his wife and impose sanctions on a party that refuses to cooperate. This is an important factor in the problem of the Agunah – a wife who is 'chained' to a husband who refuses to give her a divorce, even against the order of a Beit Din."
Miller, Akiva. (2014.) The Policing of Religious Marriage Prohibitions in Israel: Religion, State, and Information Technology, 31 J. Marshall J. Info. Tech. & Privacy L. 23