Army chief Sisi, now defence minister in Egypt's interim government, deposed Islamist President Mohamed Mursi in July after mass protests against his rule and is widely expected to announce his candidacy within days and win an election easily.
Before he can run for president he must step down from his government post.
The reshuffle will not be announced before a visit by Beblawi to Saudi Arabia, a major financial supporter of Egypt's interim government, on Tuesday and Wednesday, the privately-owned Al-Masry Al-Youm newspaper quoted him as saying.
The reshuffle is to include the defence ministry and the ministry for international cooperation, whose head, Ziad Bahaa El-Din, tendered his resignation last Monday, according to the report.