There are many types of polyurethane sponge (PUS), depending on properties such as hardness, flexibility and surface texture. The fact that it can be produced in any shape and size has given it very wide range of applications. Surface modification is one of the most commonly used methods to improve the performance of PUS. Here, inspired by metal coordination polymers, a simpler and faster method for surface modification of PUS with metal ions compared to bulk modification was proposed. In the case of copper, which is often used for PUS modification, the change in the basic properties sought in different applications as a function of the concentration of the modifier was investigated. Samples prepared by immersing sponges in solutions of copper chloride salt were subjected to physical, thermal and morphological analyses. Due to the modification, the coordination bonds between CuCl2 and polyurethane were revealed by XPS and FTIR. SEM and EDS studies of the PUS revealed both closed and open cells. DSC and TGA analysis showed that the obtained product had better thermal stability than the unmodified product. When the PUS was modified with 0.5 Cu, the water contact angle increased from 101.32° to 135.01° and hydrophobic properties were imparted to all pore surfaces, and the desired properties such as porosity, density could be adjusted. Furthermore, it is envisaged that the surface, mechanical and thermal properties will make it suitable for use in a range of practical applications such as medical and environmental.