  We propose to use T-odd momentum correlations as physical observables to
study T violation in $B\to K^{*}l^{+}l^{-} (l=e,\mu)$ decays. We show that
these observables are zero in the standard model but sizable at the level of
10% in the supersymmetric model. These large T violating effects are measurable
at the B-factories in KEK and SLAC and future hadron colliders. We also point
out that the T violating effects are insensitive to nonperturbative QCD
contributions.
