"The problem is that there doesn't seem to be a suitable time window for a Test series," UCB's General Manager Brian Basson was quoted as saying.
The 66-year-old Ray Mali, a former president of the Border Cricket Union in the town of East London takes over from Percy Sonn.
South African cricket authorities have decided to relax security measures for the international series between South Africa and Pakistan starting with a one-day match in Durban on Sunday.
Lance Klusener is to take legal action against the UCB of South Africa for unfair dismissal after his exclusion from the team following the World Cup.
Lance Klusener and the United Cricket Board of South Africa have reached an out-of-court settlement over the player's legal action against the Board.
The 37-year-old campaigner split the webbing between his index and middle fingers as he attempted to stop a hot cover drive from West Indies opener Devon Smith in the opening Test in Guyana.
The 25-year-old was arrested for drink-driving in Tasmania early on Friday by Hobart police.
South Africa are due to play a triangular one-day tournament, which also involves India, and two Tests against Bangladesh.
The all-rounder has also been excluded from the one-year contracts to 20 players.
Former International Cricket Council CEO Haroon Lorgat was on Saturday appointed as the new chief executive officer of the Cricket South Africa (CSA), replacing the controversial Gerald Majola.