\documentclass{article}
\usepackage{threeparttable}
\usepackage{multirow}
\usepackage{booktabs}
\usepackage{xcolor}
\usepackage{tikz}
\begin{document}
\begin{table}[!ht]
\setlength\tabcolsep{0pt}
\centering
\begin{threeparttable}
\begin{tabular}{@{\extracolsep{2ex}}*{4}{cc@{\hskip 4.0pt}cc}}
\toprule
 & \multicolumn{3}{c}{Spanned columns} \\[4.0pt]
\multirow[t]{3}{*}{Spanned rows} &  &  &  \\
 &  &  &  \\
 &  &  &  \\
\bottomrule
\end{tabular}
\end{threeparttable}
\end{table}
\end{document}