Increasing the efficiency and the reliability of converters are the main goals in power electronics. This research contributes to these goals by investigating how to integrate nonintrusive current measurement into Gallium Nitride (GaN) power modules. Therefore, Finite Element Analysis (FEA) simulations are conducted to determine the location of the sensor as well as the power electronic layout and the AC capacitor placement. These simulations and the experience gathered while working with a synchronous GaN buck converter and an anisotropic magnetoresistive (AMR) sensor board lead finally to the design of the GaN power module, which is presented in this article. The novel outcome of this project is the current sensing unit included in the power module. Based on the simulation results, it was decided to measure the current mismatch between the two parallel GaN switches for reliability assurance and circuit protection. Moreover, the sensor choice is discussed and experimental measurements with the board are presented.