Not in these words. The sentence does not appear in Lionel Giles's 1910 English translation of The Art of War, the standard public-domain version. The book does talk about chaos and about opportunity, but in separate passages that say something different, and no earlier source for the English line has been found.
What it means
Disorder is not only a threat: when everything is unsettled, there are openings that calm conditions do not offer. As a motivational line it is usually aimed at business or personal setbacks.
Where it comes from
The nearest passage on chaos is in chapter V, “Energy”, verse 16: “Amid the turmoil and tumult of battle, there may be seeming disorder and yet no real disorder at all; amid confusion and chaos, your array may be without head or tail, yet it will be proof against defeat.” That is a point about a well-drilled army looking disordered without being so, not about chaos creating chances.
The nearest passage on opportunity is in chapter IV, “Tactical Dispositions”, verses 1 and 2: the good fighters of old first made themselves safe from defeat “and then waited for an opportunity of defeating the enemy”, because “the opportunity of defeating the enemy is provided by the enemy himself.” In Sun Tzu the opportunity comes from the other side's mistake, not from chaos as such. Neither Wikiquote's page for Sun Tzu nor our search of the Giles text turns up the popular sentence, and we have not found where it first appeared.