\documentclass[twocolumn]{article}
\newcommand*{\realcolumnseprule}{}
\let\realcolumnseprule\columnseprule
\def\columnseprule{\realcolumnseprule
  \hskip5\realcolumnseprule
  \vrule width\realcolumnseprule
}
\setlength{\realcolumnseprule}{.4pt}

\begin{document}
test\newpage test
\end{document}