Dangerous goods packagings must be approved based on design type tests according to the international dangerous goods regulations. This includes drop testing to assess a package’s resistance to mechanical damage. Thereby, a filled package that is ready for transportation is dropped under gravity and gets decelerated onto the essentially unyielding surface of an impact target. A main requirement for drop tests of dangerous goods packagings is that the impact target’s mass shall be at least 50 times that of the heaviest package to be tested. Nevertheless, many manufacturers do not possess foundation structures for drop tests with the required mass ratio. Previous evidence highlights that the mass ratio is not a decisive criterion on its own as the impact target’s connection to the ground is essential as well. However, this influence is not easily quantifiable since experimental measurements with sensor systems are not possible at most facilities. Finite-element (FE) drop test simulations can be a powerful and cost efficient tool in evaluating the suitability of already installed impact target foundation structures without adding sensor systems. The objective of this work is to provide a detailed analysis on the influence of the contact stiffness between foundation and ground in drop testing based on validated FE models. This research is highly beneficial for industrial application since it allows manufacturers to make informed predictions about the mechanical response of installed impact target foundations.