A two-dimension confined supersonic rectangular cavity (cavity length-to-depth ratio: \(L/D=2\) , freestream Mach number: \(M_\infty =2.0\) , duct height: \(H/D=2\) ) is numerically investigated using a commercial flow solver through the detached eddy simulation (DES) module. The study’s primary aim is to examine the impinging shock’s proximal effect on the cavity’s separated shear layer as part of the extension to the author’s previous work (Karthick, Phys Fluids, 2021). The impinging shock’s proximal locations to the shear layer are varied along the streamwise distance in five steps: \([x/D] = [0,0.5,1,1.5,2]\) with the cavity entrance as the origin. Analysis in terms of mean and fluctuating static pressure field, cavity wall statistics, \(x-t\) or shock trajectory construction, and subsequent spectral analysis are done. The coupled interaction of the cavity and shock-shear layer modes causes increased cavity resonance as the interaction location moves halfway downstream. The findings can potentially aid in constructing active/passive cavity-based flow control strategies.