As described by Moses, Sugarcandy Mountain does, indeed, seem to be likened to heaven.
In Chapter 2 of Animal Farm after the death of Major, the animals hold secret meetings while Mr. Jones sleeps, discussing the possibility of revolution. In her simplicity Mollie, the white mare, asks, "Will there still be sugar after the Rebellion?" Thus, at least for her, sugar represents a delicacy and pure happiness. Later on, Moses, "Mr. Jones's especial pet," who, perhaps, represents Rasputin, the religious ascetic and mystic healer who was the confidant of the Czarina Alexandra, tells the animals about the existence of "a mysterious country" called Sugarcandy Mountain where animals go after they die. So, it would seem that this paradise does symbolize heaven.
It was situated somewhere up in the sky, a little distance beyond the clouds, Moses said. In Sugarcandy Mountain it was Sunday seven days a week, clover was in season all the year round,[also very sweet] and lump sugar and linseed cake grew on the hedges.
Also, as the leaders of the revolution, the pigs make efforts to "counteract the lies put out by Moses." This action parallels the efforts of the Russian Revolution to do away with religion, especially the Russian Orthodox Church, which had a strong influence on the people as "the opiate of the people." Of course, within the Christian religions such as the Russian Orthodox there is the belief in heaven, a mystical place of happiness.