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We suggest a natural split mechanism for sfermions based on $N$=2supersymmetry (SUSY). $N$=2 SUSY protects a sfermion in an $N$=2 multiplet fromgaining weight by SUSY breaking. Therefore, if partly $N$=2 SUSY is effectivelyobtained, a split spectrum can be realized naturally. As an example of thenatural split mechanism, we build a gauge-mediated SUSY breaking-like modelassuming $N$=2 SUSY is partly broken in a UV theory. The model explains theHiggs boson mass and the muon anomalous magnetic dipole moment within$1~\sigma$ level with a splitting sfermion spectrum. The model has seven lightsparticles described by three free parameters and predicts a new chiralmultiplet, sb: the $N$=2 partner of the ${\rm U(1)_Y}$ vector multiplet. Thebini, the fermion component of the sb, weighs MeVs. We mention the experimentaland the cosmological aspects of the model.

Natural Split Mechanism for Sfermions: $N$=2 Supersymmetry in Phenomenology