Provided is a liquid pump included in a module in which a flow path is changed depending on an operation mode. The liquid pump may have a flow path change means and a liquid transfer means integrallyformed with each other; may reduce a package size by forming an inner flow path which may change a flow of cooling water in the flow path change means and the liquid transfer means which are integrally formed with each other; may have a simplified assembling structure and a coupling structure preventing both cooling water leakage and assembly loosening; and may minimize the number of components, assembling tools and connected portions in the module.