S.C. Code Ann. § 62-7-201
(a) Subject to the provisions of Section 62-1-302(d), the probate court has exclusive jurisdiction of proceedings initiated by interested parties concerning the internal affairs of trusts. Proceedings that may be maintained pursuant to this section are those concerning the administration and distribution of trusts, the declaration of rights, and the determination of other matters involving trustees and beneficiaries of trusts. These include, but are not limited to, proceedings to:
(c) The probate court has concurrent jurisdiction with the circuit courts of this State of actions and proceedings concerning the external affairs of trusts. These include, but are not limited to, the following proceedings: