The war, now in its seventh month, has killed more than 34,000 Palestinians, according to Gaza health authorities
A high-level committee will be formed to start implementation of the joint Arab force decision, Xinhua cited Sisi as saying.
In his speech on the final day of the two-day Arab League summit held in the Egyptian resort of Sharm el-Sheikh, Sisi added that the heads of the Arab armies will soon meet to discuss the mechanism of the unified force.
The Arab foreign ministers said in the draft of the final communique that "the unified force will intervene military to counter challenges that threaten safety and security of the member states, based on request of the concerned country".