A system for artificially interlocking an automatic transmission includes an engine RPM sensor and a vehicle speed sensor. A pair of ultrasonic sensors measure a relative velocity of a vehicle to a neighbor vehicle, and an angle measuring sensor measures a degree of an angle variation of a steering wheel. An ECU determines whether an accelerator pedal is erroneously operated by monitoring sensing signals of the engine RPM sensor and the vehicle speed sensor, to determine whether the accelerator pedal is erroneously operated by using sensing signals of the ultrasonic sensors, and to determine whether the accelerator pedal is erroneously operated by monitoring a signal of the angle measuring sensor. A transmission control unit (TCU) performs an artificial interlock control of the automatic transmission when a determination signal, which informs that the accelerator pedal is erroneously operated, is received from the ECU.