An electronic device is provided. The electronic device includes a foldable housing, a communication circuit, a first transmission/reception circuit configured to transmit/receive a signal in a first frequency band, a first antenna electrically connected to the first transmission/reception circuit, and disposed on a portion of the first side member, a second transmission/reception circuit configured to transmit/receive a signal in a second frequency band different from the first frequency band, a second antenna electrically connected to the second transmission/reception circuit, and disposed on a portion of the first side member, a sensor configured to detect a contact of a user's body portion, and a processor. The processor may be configured to cause the first transmission/reception circuit to be electrically connected to the second antenna such that the signal in the first frequency band is transmitted/received through the second antenna when the contact of the user's body portion is detected by the sensor.