I came across this situation before, where a sibling refused to move out of an inherited property to allow its sale.
Putting to one side the negative effects on the relationship with your sibling, you may wish to consider legal action.
Assuming that you are both tenants in common, you may be able to apply to the courts for an order for the partition and sale of the property (under the Land and Conveyancing Law Reform Act 2009 Section 31 (a) - An order for partition of land among the co-owners).
As far as I recall the legal fees and court costs were between €3k and €4k. The solicitors on this site are extremely helpful. I'm sure one of them will oblige with an up to date estimate of costs and the process involved.
SM