How to have titlesec-like behaviour in KOMA-Script?

Add a \clearpage to each section:

\documentclass{scrartcl}
\addtokomafont{section}{\clearpage}
\begin{document}

\section{foo}foo
\section{bar}bar
\subsection{foooo} foooo
\section{baz}baz
\section{foobar}foobar

\end{document}

All credit goes to cgnieder for this solution.

\usepackage{etoolbox}

\preto\section{\clearpage}

\begin{document}
\section{Section One}
\section{Section Two Should Start On Another Page}
\end{document}