  The circumnuclear material around Active Galactic Nuclei (AGN) is one of the
essential components of the obscuration-based unification model. However, our
understanding of the circumnuclear material in terms of its geometrical shape,
structure and its dependence on accretion rate is still debated. In this paper,
we present the multi-epoch broadband X-ray spectral modelling of a nearby
Compton-thick AGN in Circinus galaxy. We utilise all the available hard X-ray
($> 10$ keV) observations taken from different telescopes, $i.e.,$ $BeppoSAX$,
$Suzaku$, $NuSTAR$ and $AstroSat$, at ten different epochs across $22$ years
from $1998$ to $2020$. The $3.0-79$ keV broadband X-ray spectral modelling
using physically-motivated models, namely MYTORUS, BORUS02 and UXCLUMPY, infers
the presence of a torus with a low covering factor of $0.28$, an inclination
angle of $77^{\circ}$ $-$ $81^{\circ}$ and Compton-thick line-of-sight column
densities ($N_{\rm H,LOS} = 4.13~-~9.26~\times~10^{24}$ cm$^{-2}$) in all the
epochs. The joint multi-epoch spectral modelling suggests that the overall
structure of the torus is likely to remain unchanged. However, we find
tentative evidence for the variable line-of-sight column density on timescales
ranging from one day to one week to a few years, suggesting a clumpy
circumnuclear material located at sub-parsec to tens of parsec scales.
