Various techniques exist for improving the mechanical property of soils. They differ in methods, consistency of treatment, expenses, environmental implications, and site accessibility demands. One of the recent techniques is through the use of microbial induction, and this paper aims to study the effect of commercial Bacillus subtilis on the shear strength of soils. The soils used for the experiment are for local coarse sand and black soil, and they are treated with the Bacillus subtilis with an activator period. The treated soils are subjected to shear box tests to determine the shear strength performance. It is expected that, throughout, the study will bring a sustainable approach to stabilizing and improving soil conditions.