This study examines the effect of skirting on the ultimate bearing capacity (UBC) of strip footings subjected to static load on a two-layer sandy soil slope with a uniformly distributed load. Utilizing finite element limit analysis (FELA) through upper and lower-bound analysis, the research introduces the Bearing Capacity Ratio (BCR)—the ratio of the UBC of strip footings with and without skirts on soil slopes. A detailed parametric analysis assesses the influence of skirting on UBC, focusing on the normalized vertical depth of skirting (z/B), the normalized setback distance of the footing (b/B). Results indicate a linear increase in BCR with increasing z/B for any given b/B and d/B, with BCR stabilizing when b/B exceeds 2 across all z/B ratios when d/B is zero. The optimal ranges for z/B and b/B ratios, where BCR stabilizes, vary with the footing’s embedment depth (d/B). Additionally, the study illustrates failure mechanisms of strip footings on weak sand layers over strong sand slopes, highlighting the impact of skirting at various slope inclinations.