Multiple-input multiple-output orthogonal frequency- division multiplexing (MIMO-OFDM) is a promising modulation scheme for high performance broadband wireless communications. However, one major drawback of MIMO- OFDM is the high peak-to-average power ratio (PAPR) of the output signals. Latinovic et al. Proposed a PAPR reduction method termed polyphase interleaving and inversion (PII) for MIMO-OFDM systems under the use of the space-frequency block coding (SFBC). In this paper, we find more degrees of freedom can be utilized among the multiple antennas for the SFBC MIMO-OFDM systems. Hence, we present four additional cross-antenna SFBC patterns, and based on these patterns, we propose two new efficient PAPR reduction schemes for SFBC MIMO-OFDM systems. The simulation results show that, even with the same computational complexity, the proposed scheme would have better PAPR reduction performance than the PII method.