Effects of sida acuta extract on the corrosion behaviour of API 5L-X65 steel under sand deposit in CO₂ saturated oilfield brine has been studied. Tafel extrapolation method has been employed to determine the corrosion rate of the alloy under sand deposit with and without sida acuta extract. Atomic force microscopy was employed to study the surface roughness of the steel. Phytochemical analysis and Fourier transformed infrared (FTIR) spectroscopy was used to identify the functional groups present in the extract. The presence of sand retarded the inhibitor efficiency at lower dosage but better corrosion inhibition was obtained at higher inhibitor dosage.