It's better to have a different command than \ref, because you might need the latter for referring the section without the § prefix. The § symbol is.
chateaubretagne.info › ~reu › docs › latex_symbols.
This document lists symbols and the corresponding LATEX This section lists symbols that are intended for use in running text, such as.
The section sign (§) is a typographical glyph for referencing individually numbered sections of a document; it is frequently used when citing sections of a legal code. Encoded as Unicode U+00A7 § SECTION SIGN and HTML § it is also commonly called section symbol, section mark, double-s, silcrow.