  We propose a possible explanation of the recent diphoton excess reported by
ATLAS and CMS collaborations, at around 750 GeV diphoton invariant mass, within
the framework of $E_{6}$ motivated Alternative Left-Right Symmetric Model
(ALRSM), which is capable of addressing the $B$ decay anomalies in the flavor
sector, the $eejj$ and $e$ missing $p_{T}jj$ excesses reported by CMS in run 1
of LHC and has the feature of high scale leptogenesis. We find that gluon-gluon
fusion can give the observed production rate of the 750 GeV resonance,
$\tilde{n}$, through a loop of scalar leptoquarks ($\tilde{h}^{(c)}$) with mass
below a few TeV range, while $\tilde{n}$ can subsequently decay into
$\gamma\gamma$ final state via loops of $\tilde{h}^{(c)}$ and
$\tilde{E}^{(c)}$. Interestingly, the $\tilde{E}^{(c)}$ loop can enhance the
diphoton branching ratio significantly to successfully explain the observed
cross section of the diphoton signal.
