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Systems utilizing OFDM technique are plagued by the problem of high PAPR values in the transmitted signals. One popular solution is to apply selective mapping (SLM) technique. In this paper, SLM performance is studied in the context of MIMO-OFDM systems. The original SLM scheme for SISO-OFDM system is modified to use new phase sequence matrix based on a type of matrices call centering matrix. The new SLM scheme can be extended easily to the case of MIMO-OFDM systems. Its PAPR reduction performance is then compared with other modified SLM schemes. MATLAB simulations show that our proposed SLM modification significantly improves the PAPR reduction. It also outperforms some of the previously proposed SLM modifications.