In order to improve the reality of false-target image in deception jamming against Inverse Synthetic Aperture Radar(ISAR), the signal modeling of two-dimensional decoys in Self-Screening Jamming(SSJ) scenarios with controllable position is studied based on the modulation template in scattering center model. Firstly, the time delay in the fast time domain corresponding to the longitudinal modulated coordinates and offsets can control the position of the false target in the down range. Secondly, the phase modulating coefficient in the slow time domain corresponding to the transverse modulated coordinates and offsets can control the position in the cross range. Thirdly, the modulated speed would cause horizontal extension or compression of the false-target image. The simulation results verify the correctness of the theoretical analysis and demonstrate the effectiveness of the proposed jamming method, and it also has low power requirement.