© 2022Modified double sub-equation method is a highly reliable and quick process in order to attain complexiton solutions of nonlinear partial differential equations. This method employs two wave transformations which pave a way of finding more general solutions than methods employ just one wave transformation. Exponential function solutions or trigonometric function solutions can also be derived depending on choice of parameters. In this paper, applicability of modified double sub-equation method to new form of (3+1)-dimensional BKP-Boussinesq equation is shown. Some illustrations of obtained solutions are given to make more clear and understandable complexitons and their propagations.