In the present work, effect of eco friendly treatment (by NaHCO3) and eco friendly coating (by PLA) on erosive wear properties of sisal composites has been studied. Three types of epoxy based composites reinforced with various types of sisal fibres (i.e. untreated, treated, and treated and coated) were fabricated by hand layup technique using fibres length 15 mm and wt% as 16. The fabricated sisal composites were subjected to air jet erosion test at various impingement angles (i.e. 30, 45, 60 and 90°), various velocities (i.e. 31.58, 52.94, 75 and 100 m s−1) and at a constant feed rate of 10 g min−1. Morphological analysis of eroded surfaces of the samples was also evaluated by Scanning Electron Microscopy. The experimental results suggested that the maximum wear resistance was offered by the treated and coated fibres reinforced composite, which has 28.34%, 22.22%, 29.85% and 18.23% lower wear rate than that of pure sisal composite at 60° impact angle and at various velocities 31.58, 52.94, 75 and 100 m s−1 respectively. The outcome of the experimental results shows a successful effort of a newer surface modification method.