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We investigate the effect of intrinsic sea quark-antiquark pairs on the magnetic moments of the SU(3) octet baryons. The intrinsic quark-antiquark pairs are introduced by a model of energetically-favoured non-perturbative baryon－meson fluctuations. It is shown that the baryon－meson fluctuation model provides a mechanism of SU(3) symmetry breaking in the baryon sea and is related to the violations of Gell－Mann－Okubo and Coleman－Glashow sum rules for the baryon magnetic moments. Such a model is also consistent with its explanation of the violations of Gottfried and Ellis－Jaffe sum rules in deep inelastic scattering.