There are two ways of jointly owning a property. You can either be 'joint tenants' (where neither person owns a 'share in the property, as it's their 'partnership' which owns the whole of it) or you can be 'tenants in common' (where you each own half of the property). The answer to your question depends upon which type of co-ownership you and your husband have.
So your first step needs to be to determine whether you're joint tenants or tenants in common. Go here and pay £3 to download a copy of the title register:
https://www.gov.uk/search-property-information-land-registry
Check that you and your ex are both shown as co-owners and then look for this wording:
"No disposition by a sole proprietor of the registered estate (except a trust corporation) under which capital money arises is to be registered unless authorised by an order of the court".
If that wording is present then you're tenants in common. That means that you can apply to a court for an 'order of sale'. (Although the forms are available online, it's not simple; get a solicitor!)
If the wording above isn't present then you're joint tenants. You can still seek an order of sale through a court but it's likely that you'd need to severe the joint tenancy first (so that you'd then become tenants in common) , making the process somewhat more complicated.
So you clearly need to consult a solicitor but in the knowledge that the answer to your question ("Can I force a sale?) is going to be "Yes".