Most current numerical simulations on sloshing impact loads do not take into account the possibility of evaporation and condensation of the fluid. Thus, in order to evaluate the influence of phase change the goal of this work is to develop a numerical model able to simulate a wave impact with phase change. Such a model should describe compressible multiphase flows with separate phases, including non-equilibrium interfacial phase change. A first prototype is presented in this paper based on an isothermal Volume-Of-Fluid-type model for the representation of the liquid-vapor interface and a non-conservative advection term for the modelling of phase change. Discretization of the model is made in the Finite Volume framework using a Roe-type scheme. Some original numerical test cases for the validation of the code are discussed and preliminary results for a simplified impact test case are presented.