A method of strengthening that is considered to be highly effective is the utilization of external steel wire rope (SWR). Predicting the flexural performance of reinforced concrete (RC) beams strengthened with external SWR is the objective of this study. An analysis using finite element (FE) method is presented and the results are verified by comparing them to laboratory tests conducted on five beams. Despite having identical rectangular cross-section geometries and being subjected to four-point bending, the SWR configurations of the beams varied. An assessment was conducted to evaluate the efficacy of three different constitutive laws, namely smeared crack, bilinear, and elastic-linear, in accurately describing the behaviors of concrete, steel, and SWR materials, respectively. The findings demonstrated a strong correlation with the experimental data, specifically regarding the load–displacement behavior, ultimate load, and failure modes.