A man has been charged after allegedly sexually touching two girls at a shopping centre in Western Sydney. 

Police allege the 46-year-old targeted the two girls in separate incidents both at Westfield Parramatta on Church St about a month apart.

A 17-year-old girl reported she was allegedly sexually touched at the centre on June 14, prompting an investigation the following day.

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About a month later, police received a second report alleging the man had approached a 10-year-old girl multiple times before allegedly sexually touching her at the same shopping centre on July 11.

Following inquiries, detectives executed a search warrant at a home on Cowper St in Parramatta, where they arrested the man.

He was charged with sexually touching another person without consent, two counts of intentionally sexually touching a child more than 10 years and less than 16 years, and possessing a prohibited drug.

He was refused bail and appeared before Bail Division Local Court 9 on Saturday.

A provisional apprehended violence order (AVO) was granted, and he is due to reappear before the court on August 6.