Usage of sound waves in the medical field is expanding to separate cells. According to the density, compressibility, particle radius and even other effective parameters such as particle sticking, the sound wave enters the particles in the fluid. Particles are designed and disassembled in different designs, depending on their size and density. The rate of separation of particles or cells such as red blood cells and white cells from cancer cells depends on several factors. Two of the most influential factors in this case are cell deformation and interparticle forces. Various models have been proposed to investigate cell deformation. The most popular solid models proposed are elastic and viscoelastic models. In this research, the cell is modeled in the fluid environment under the influence of sound waves and deformations are obtained. To achieve this, the Helmholtz equation, which combines the disturbance equations of sound waves and the Navier Stokes equation, is solved and acoustic pressure is obtained. This pressure is then applied to the cell as a deformation agent and is deformed by the fluid and solid interaction (FSI). In this study, an acoustic force was initially obtained, and then the cell deformation with elastic properties was presented and validated with previous studies. Finally, deformation for the cell is obtained by assuming the viscoelastic properties that have not been used to model the deformation in the acoustic field so far. The results show that the viscoelastic model for the cell has a better fit in comparison with the elastic model with experimental results. Also, the effect of frequency on the aspect ratio is also investigated. As the frequency increases from 2 to 8 MHz, the aspect ratio is increased to 1.3. In the study of interactive acoustic forces, this study has been used to model previous numerical and experimental studies, and force values have been evaluated with previous validation studies. Keywords : Sound Waves, Viscoelastic, Fluid Solid Interaction