Ball and tire impact sources are used as standard heavy-weight impact sources to induce heavy-weight impact sound. To predict the impact sound insulation performance accurately, the modeling of impact sources is important. In this paper, new single-degree-of-freedom (SDOF) models are proposed. Numerical calculations validate that using the proposed SDOF models can predict the impact force exposure levels accurately. Then, a numerical example is used to investigate changes in impact force exposure levels when impact sources acting on the dry-type double floor system.