A mathematical model was developed that included self-propelled objects in motion with deformation, such as droplets, and self-propelled objects without deformation, such as camphor. This study represents the self-propelled object by a volume-conserving Phase-Field equation derived from the $L^2$ gradient flow. The self-propelled object shape during motion is successfully controlled depending on the parameters included in the model equations. Moreover, adding a spatially inhomogeneous function to the potential term made it possible to represent the self-propelled object motion in elliptical and dumbbell shapes.