sandbox: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/sandbox - from package: policycoreutils-python

You may install the required package with command yum install {package}

Error in other languages:
sandbox: bevel nie gevind nie
sandbox: comandă negăsită
sandbox: comando não encontrado
sandbox: commande introuvable
sandbox: command not found
sandbox: käsku ei ole
sandbox: không tìm thấy lệnh
sandbox: komanda nerasta
sandbox: Kommando nicht gefunden.
sandbox: kommandot finns inte
sandbox: komut yok
sandbox: nie znaleziono polecenia
sandbox: níor aimsíodh an t-ordú
sandbox: no se encontró la orden
sandbox: no s'ha trobat l'ordre
sandbox: opdracht niet gevonden
sandbox: parancs nem található
sandbox: perintah tidak ditemukan
sandbox: príkaz nenájdený
sandbox: příkaz nenalezen
sandbox: команда не найдена
sandbox: командата не е открита
sandbox: 命令找不到
sandbox: コマンドが見つかりません