He was the son of vicar Søren Sigwardt (1729–1792) and his first wife Ulrikke Leonore, née Weinwich.

He took his primary and secondary education under the tutoring of his father until he was 18 when he went to a school in Christiania where Herman Amberg taught him.

[1] In 1796, Sigwardt became a curate in Vaale in Vestfold working under the parish priest Frants Philip Hopstock (whose daughter he married in 1798).

In 1799, he became a chaplain and inspector at the teacher's seminary in Tønsberg in Vestfold county.

He got sick during a trip to Mandal in 1839, and he died in Christianssand on 8 October 1840.