A displacement-sensing scheme is presented herein by utilizing near-field coupling between multiple coils. The sensing system consists of the stationary part and removable sensor tag. The change in the relative position between the stationary part and the sensor tag can result in the variation of characteristic frequencies, which can be retrieved from the impedance of the reader antenna on the side of the stationary part. The lumped model of the system is established for theoretical analysis, and the results of the analysis were verified by electromagnetic simulation. A prototype of the system was fabricated by printed circuit board (PCB) technology to carry out tentative experiments, the results of which were used to verify the findings of the theoretical analysis and simulation. The results of the experiment conducted in the lab demonstrated that the sensor is capable of the contactless measurement of displacement from 3 to 10 mm with a considerable average sensitivity of 1.5 MHz/mm.