\documentclass[a6paper]{scrbook}% a6paper only for demo
\usepackage{afterpage}
\AtBeginDocument{%
  \addtocontents{toc}{%
    \protect\afterpage{\protect\markboth{%
      \protect\contentsname{} (Continued)%
    }{%
      \protect\contentsname{} (Continued)%
    }}%
  }%
}
% --------- only for demo start ------------
\newcommand*{\sectionloop}{%
  \ifnum\value{section}<99\section{Test}Text\sectionloop\fi%
}
% --------- only for demo end ------------
\begin{document}
\tableofcontents
\chapter{Test}
\sectionloop
\end{document}