The primary concern of the present investigation is the energy control of the nonlinear sine-Gordon model driven by several in-domain actuators. The speed-gradient method that has corroborated its utility for the sine-Gordon model, controlled through the manipulable parameters of the external electrical field and boundary actuation, is now generalized to the in-domain actuation, aiming to pump/dissipate the energy of the model to a desired level. Capabilities of the method are illustrated in numerical simulations.