This dataset contains the experimental and simulation data underlying the main figures in the associated publication "Dynamic Modulation of Long-Range Photon–Magnon Coupling" (Communications Physics, 2026). It includes VNA S-parameter measurements of the remotely coupled cavity-magnon system and the corresponding FPGA-based time-domain ringdown data, along with the Python simulation outputs used to generate the theoretical predictions and fits for the frequency spectra and time-domain responses presented in the paper.