This paper proposes a method to enhance the detection range of 60-GHz radar modules. The antenna gain of the radar modules can be enhanced by adding a metamaterial radome. As electromagnetic waves emanate from the antenna and pass through the metamaterial radome, they undergo an additional phase delay in specific regions. This phenomenon creates a focusing lens effect. This flattens the wavefront of the electromagnetic waves above those regions, thereby increasing the radiation gain of the antennas. We propose composite and wire metamaterial radomes designed for 60-GHz Antennas in Package (AiP) and 3T4R radar modules, respectively. Simulation and measurement results show that the AiP radar module with the proposed composite metamaterial radome can increase the antenna gain by more than 3-dB. On the other hand, equipping the 3T4R radar module with the wire metamaterial radome can increase the gain of the series-fed patch antenna array by approximately 2-dB. This indicates that the radar detection capability will be significantly improved.