As far as I know, yes. (Although if your employer is subsidising any of the cost for you then your wife will have to pay the full premium).
Anybody can access any/all policies sold by any health insurer. There are no policies that are restricted to only certain/select customers. That's part of the reason that there are so many policies on the market!
Compare health insurance plans across a wide variety of providers in Ireland. You can also compare your current health insurance plan with other plans available.