An Army warrant officer was sentenced to five years in prison yesterday in federal court in Alexandria and his Thai-born wife was given an eight-year prison term on charges they were involved in the sale of high-quality heroin smuggled into the United States from Southeast Asia.

Four other Thai nationals who had entered guilty pleas for their role in the case were also sentenced to various prison terms yesterday by U.S. District Court Judge Richard L. Williams.

Chief Warrant Officer John A. Davis, 38, of 3903 Old Bridge Rd., Woodbridge, and his wife, Vundee Klueymai Davis, 41, who was described by Williams as the ring leader, were arrested after undercover agents last May bought 33 ounces of what they said was 90 percent pure heroin with an estimated street value of $2 million.

Williams sentenced John Davis, who had pleaded guilty to one count of heroin possession with intent to distribute, to five years prison and five years special parole. Vundee Davis, who pleaded guilty to two counts of the same charge, was sentenced to concurrent terms of eight years in prison and eight years special parole.

The four other defendants sentenced yesterday:

* Pronchai Phershayaphai, 33, of 3000 Furman La., Alexandria, who pleaded guilty to possession with intent to distribute and was sentenced to five years in prison and five years special parole.

* Monica Mandel, 32, who was sentenced to six months in prison and three years probation for using a telephone to aid in distribution of heroin.

* Sunt Mongkol, 39, of 3514 Randolph Rd., Silver Spring, who was sentenced to two years in prison and five years special parole for distribution of heroin.

* Paichayon Kiochandra of Los Angeles, who was placed on three years probation on the condition he returns to Thailand within 60 days. He had pleaded guilty to two counts of illegal use of the telephone and aiding in the distribution of heroin. Williams also fined him $1,900.