Radio Frequency (RF) sensing and imaging are heavily used in remote sensing, security, and surveillance. This paper studies its security by developing a novel method that can compromise it in an evasive manner via the Digital Twins (DT) technology. The compromise method can make the imaging system generate false but normal-looking images. The method exploits a dynamic digital twin to emulate the imaging system, based on which compromise signals are optimized and transmitted while the victim system is conducting sensing. Simulations and experiments are conducted to demonstrate the validity of the proposed method.