  We consider a composite Higgs model based on the $SU(6)/Sp(6)$ coset, where
an $U(1)$ subgroup of $Sp(6)$ is identified as the flavor symmetry. A complex
scalar field $s$, which is a pseudo-Nambu-Goldstone boson of the broken
symmetry, carries a flavor charge and plays the role of a flavon field. The
$U(1)_F$ flavor symmetry is then broken by a VEV of the flavon field, which
leads to a small parameter and generates the mass hierarchy between the top and
bottom quarks. A light flavon below the TeV scale can be naturally introduced,
which provides a fully testable model for the origin of flavor hierarchy. A
light flavon also leads to substantial flavor changing neutral currents, which
are strongly constrained by the flavor precision tests. The direct search of
additional scalar bosons can also be conducted in HL-LHC and future hadron
colliders.
