Provided is an apparatus and a method of restricting an access to an application module of a mobile wireless device. The apparatus for restricting an access to an application module of a mobile wireless device according to an exemplary embodiment of the present invention includes an access restriction unit for receiving a request for an access to an application module from a basic module, and for restricting the access of the basic module to the application module when a restriction on the access is required. Further included is an access restriction determination unit for determining whether the restriction on the access of the basic module to the application module according to an access environment is required. Also included is an access environment determination unit for monitoring the access environment of the basic module to the application module and for providing the access restriction determination unit with a result of monitoring the access environment.